2019 2017
CMOS fractionalorder capacitor/inductor emulator chip (2016)
CMOS fractionalorder capacitor emulator chip (2016)
List of Journals
Journal

Impact Factor

Publisher

J. Power Sources

7.47

Elsevier

Energy

5.54

Elsevier

Scientific Reports

4.52

Nature

Electrochimica Acta

5.38

Elsevier

Applied Soft Computing

4.87

Wiley

Complexity

3.514

Wiley

Nonlinear Dynamics

4.61

Elsevier

ChemElectroChem

3.975

Wiley

J. Electrochemical Society

3.662

Electrochemical Society (ECS)

J. Franklin Institute

3.653

Elsevier

Signal Processing

4.08

Elsevier

Measurement

2.79

Elsevier

Journal of Applied Physics

2.33

American Inst. Physics (AIP)

Chaos: An Interdisciplinary
Journal of Nonlinear Science

2.64

American Inst. Physics (AIP)

IEEE J. Emerging and Selected
Topics in Circuits & Systems

3.43

Inst. Electrical Electronic Eng.
(IEEE)

IEEE Trans. Circuits &
SystemsIFundamental Circuit Theory

3.93

Inst. Electrical Electronic Eng.
(IEEE)

IEEE Trans. Instrumentation &
Measurement

3.07

Inst. Electrical Electronic Eng.
(IEEE)

IEEE Circuits & Systems
Magazine

4.48

Inst. Electrical Electronic Eng.
(IEEE)

IEEE Trans. Circuits &
SystemsII Express Briefs

3.25

Inst. Electrical Electronic Eng.
(IEEE)

IEEE Trans. Education

2.27

Inst. Electrical Electronic Eng.
(IEEE)

IEEE Trans. Computer Aided Design
of Integrated Circuits

2.4

Inst. Electrical Electronic Eng.
(IEEE)

Medical & Biological
Engineering & Computing

2.04

Springer

Computers and Electronics in
Agriculture

2.502

Elsevier

FLORA: Morphology Distribution
Functional Ecology of Plants

1.6

Elsevier

Circuits Systems & Signal
Processing

1.98

Springer

Chaos Solitons & Fractals

3.06

Elsevier

Int. J. Circuit Theory &
Applications

1.571

Wiley

Int. J. Bifurcation & Chaos

2.145

World Scientific

Int. J. Electronics &
Communications (AEUE)

2.85

Elsevier

Int. J. of Food Properties

1.43

Taylor & Francis

Int. J. Electronics

1.07

Taylor & Francis

Int. J. Electrical Engineering
Education

0.94

SAGE

Microelectronics Journal

1.28

Elsevier

Electronics Letters

1.343

Inst. Engineering and Technology (IET)

Circuits Devices & Systems

1.27

Inst. Engineering and Technology (IET)

Mathematical Problems in
Engineering

1.18

Hindawi

Computers & Electrical
Engineering

2.19

Elsevier

Analog Integrated Circuits and
Signal Processing

0.85

Springer

J. Circuits Systems &
Computers

0.6

World Scientific

Applied Physics Letters

3.52

American Institute of Physics
(AIP)


2020 A. Allagui, Di. Zhang, I. Khakpour, A. S. Elwakil and C. Wang, "Quantification of memory in fractionalorder capacitors," J. Phys. D: Appl. Phys., vol. 53, no. 2, Jan. 2020. B. Maundy, A. S. Elwakil and L. Belostotski, "Single transistor RConly secondorder allpass filters," Int. J. Circuit Theory & Applications, (DOI: 10.1002/cta.2721). B. J. Maundy, A. S. Elwakil and L. Belostotski, "Automatic generation of differentialinput differentialoutput 2nd order filters based on a differential pair," IEEE Trans. ComputerAided Design (10.1109/TCAD.2019.2912933). S. Kapoulea, G. Tsirimokou, C. Psychalinos and A. S. Elwakil, "Generalized fully adjustable structure for emulating fractionalorder capacitors and inductors of orders less than two," Circuits Systems & Signal Processing, DOI: 10.1007/s00034019012525. P. Bertsias, M. Mohsen, L. A. Said, A. S. Elwakil, C. Psychalinos, A. G. Radwan, "Design and implementation of an optimized artificial human eardrum model," Circuits Systems & Signal Processing, DOI: 10.1007/s00034019013086. S. Kapoulea, V. Bizonis, P. Bertsias, C. Psychalinos, A. Elwakil and I. Petráš, "Reduced active components count electronically adjustable fractionalorder controllers: Two design examples," Electronics, vol. 9, no. 63, pp. 9010063 (doi:10.3390/electronicsxx010005), 2020. A. Allagui, H. Alnaqbi, A. S. Elwakil, Z. Said, A. A. Hachicha, C. Wang, and M. A. Abdelkareem, "Fractionalorder electric doublelayer capacitors with tunable lowfrequency impedance phase angle and energy storage capabilities," Applied Physics Letters, vol. 116, pp. 013902, (DOI: 10.1063/1.5138243), 2020. M. F. Tolba, H. Saleh, B. Mohammad, M. AlQutayri , A. S. Elwakil, A. G. Radwan, "Enhanced FPGA realization of the fractionalorder derivative and application to a variableorder chaotic system," Nonlinear Dynamics, (doi.org/10.1007/s1107101905449w), 2020
2019 C. Vastarouchas, C. Psychalinos, A. AlAli and A. S. Elwakil, "Novel twomeasurementsonly ColeCole bioimpedance parameters extraction technique," Measurement, vol. 131, no. 1, pp. 394399, Jan. 2019. D. A. Yousri, A. M. AbdelAty, L. A. Said, A. S. Elwakil, B. J. Maundy and A. G. Radwan, "Chaotic flower pollination and grey Wolf algorithms for parameter extraction of bioimpedance models," Applied Soft Computing, Elsevier, vol. 75, pp. 75077, 2019. P. Bertsias, C. Psychalinos, A. S. Elwakil, L. Safari and S. Minaei, "Design and application examples of CMOS fractionalorder differentiators and integrators," Microelectronics J., vol. 83, pp. 155167, 2019. B. J. Maundy, A. S. Elwakil and D. Zito, "A voltage tunable CMOS differential active resistor and its application," Int. J. Circuit Theory & Applications, vol. 47, no. 1, pp. 175–185, 2019. Z. Said, A. Allagui, M. A. Abdelkareem, A. S. Elwakil, H. Alawadhi, R. Zannerni, K. Elsaid, "Modulating the energy storage of supercapacitors by mixing closetoideal and farfromideal capacitive carbon nanofibers," Electrochimica Acta, vol. 301, pp. 465471, April, 2019. T. Bonny, S. Majzoub and A. S. Elwakil, "Hardware optimized FPGA implementations of high speed true random bit generators based on switchingtype chaotic oscillators," Circuits Systems and Signal Processing, vol. 38, no. 3, pp. 1342–1359, 2019. A. A. AlAli, B. J. Maundy and A. S. Elwakil, Design and Implementation of Portable Impedance Analyzers, Springer, ISBN 9783030117832, (10.1007/9783030117849), 2019. S. Kapoulea, C. Psychalinos and A. S. Elwakil, "Oneterminal electronicallycontrolled fractionalorder capacitor and inductor emulator," Int. J. Electronics and Communications (AEUE), vol. 103, pp. 3245, May 2019. T. J. Freeborn and A. S. Elwakil, "Rates and effects of local minima on fractionalorder circuit model parameters extracted from supercapacitor discharging using least squares optimization," Circuits Systems and Signal Processing, vol. 38, pp. 19071922, May 2019. D. A. Yousri, A. M. AbdelAty, L. A. Said, A. S. Elwakil, B. Maundy and A. G. Radwan, "Parameter identification of fractionalorder chaotic systems using different metaheuristic optimization algorithms," Nonlinear Dynamics, vol. 95, no. 3, pp. 2491–2542, 2019. P. Bertsias, C. Psychalinos and A. S. Elwakil, "Partial fraction expansion based realizations of fractionalorder differentiators and integrators using active filters," Int. J. Circuit Theory & Applications, vol. 47, no. 4, pp. 513531, April 2019. B. J. Maundy, A. S. Elwakil and S. Gift, "Enhancing the improved Howland circuit," Int. J. Circuit Theory & Applications, vol. 47, no. 4, pp. 4247, April 2019. D. Zhang, A. Allagui, A. S. Elwakil, A. M. Nassef, H. Rezk, J. Cheng, W. C. Choy, "On the modeling of dispersive transient photocurrent response of organic solar cells," Organic Electronics, vol. 70, no. 7, pp. 4247, July 2019. D. Yousri, A. M. AbdelAty, A. G. Radwan, A.S. Elwakil and C. Psychalinos, "Comprehensive comparison based on metaheuristic algorithms for approximation of the fractionalorder Laplacian s^α as a weighted sum of firstorder highpass filters," Microelectronics J., vol. 87, pp. 110120, May 2019. P. Bertsias, C. Psychalinos, A. S. Elwakil and A. G. Radwan, "Lowvoltage and lowpower fractionalorder parallel tunable resonator," Microelectronics J., vol. 88, pp. 108116, May 2019. P. Bertsias, C. Psychalinos, A. S. Elwakil and K. Biswas, "Single transistor fractionalorder filter using a multiwalled carbon nanotube device," Analog Integrated Circuits and Signal Processing, vol. 100, pp. 215219, 2019. C. Psychalinos, A. S. Elwakil, B. J. Maundy and A. G. Radwan (Guest Editors), "Editorial note Special Issue on the design and implementation of fractionalorder circuits and systems in realworld applications," Microelectronics J., vol. 90, pp. 154155, 2019. M. Fouda, A. S. Elwakil, A. Allagui, H. Rezk, A. Nassef, "Convolutionbased estimation of supercapacitor parameters under periodic voltage excitations," J. of The Electrochemical Society, vol. 166, no. 10, pp. 22672269, 2019. B. J. Maundy, A. S. Elwakil and C. Psychalinos, "Correlation between the theory of Lissajous figures and the generation of pinched hysteresis loops in nonlinear circuits," IEEE Trans. Circuits & Syst.I: Regular papers, vol. 66, no. 7, pp. 26062614, July, 2019. M. A. Abdelkareem, A. Allagui, Z. Said, A. S. Elwakil, R. Zannerni, W. H. Tanveer and K. Elsaid, "Frequencydependent effective capacitance of supercapacitors using electrospun CobaltCarbon composite nanofibers," J. of The Electrochemical Society, vol. 166, no. 12, pp. 24032408, 2019. K. Baxevanaki, S. Kapoulea, C. Psychalinos and A. S. Elwakil, "Electronically tunable fractionalorder highpass filter for phantom electroencephalographic system model implementation," Int. J. Electronics and Communications (AEUE), vol. 110, pp. 152850, 2019. M. E. Fouda, A. Allagui, A. S. Elwakil, A. Eltawil, and F. Kurdahi, "Supercapacitor discharge under constant resistance, constant current and constant power loads," J. Power Sources, vol. 435, pp. 226829, 2019. W. Sayed, A. G. Radwan, M. Elnawawy, H. Orabi, A. Sagahyroon, F. Aloul, A. S. Elwakil, H. Fahmy and A. Elsedeek, "Twodimensional rotation of chaotic attractors: Demonstrative examples and FPGA realization," Circuits Systems and Signal Processing, vol. 38, pp. 4890–4903, Oct. 2019. S. Majzoub, A. S. Elwakil, C. Psychalinos and B. J. Maundy, "On the mechanism of creating pinched hysteresis loops using a commercial memristor device," Int. J. Electronics and Communications (AEUE), vol. 111, pp. 152923, 2019. B. M. Aboalnaga, A. H. Madian, A. S. Elwakil and A. G. Radwan, "Cole bioimpedance model variations in Daucus Carota Sativus under heating and freezing conditions," IEEE Access, vol. 7, pp. 113254113263, 2019. M. Fouda, A. Allagui and A. S. Elwakil, "Commercial supercapacitor parameter estimation from step voltage excitation," Int. J. Circuit Theory & Applications, vol. 47, no. 10, pp. 17051712, 2019. B. J. Maundy and A. S. Elwakil, "Thirdorder tunablephase asymmetric crosscoupled oscillator," IET Circuits Devices & Systems, vol. 13, no. 7, 929 –933, 2019. S. Kapoulea, C. Psychalinos and A. S. Elwakil, "Realizations of simple fractionalorder capacitor emulators with electronicallytunable capacitance," Integration: the VLSI Journal, vol. 69, pp. 225–233, 2019. P. Bertsias, C. Psychalinos, A. S. Elwakil and B. Maundy, "Minimum MOS transistor count fractionalorder voltagemode and currentmode filters," Technologies, 7, 85; doi:10.3390/technologies7040085, 2019.
2018
 A. Abdelaty, A. G. Radwan, A. S. Elwakil and C. Psychalinos, "Transient and steady state response of a fractionalorder dynamic PV model under different loads," J. Circuits Systems and Computers, vol. 27, no. 2, pp. 1850023, 2018.
 A. Allagui, D. Zhang and A. S. Elwakil, "Shortterm memory in electric doublelayer capacitors," Applied Physics Letters, vol. 113, pp. 253901, Dec. 2018 (Doi:10.1063/1.5080404).
 S. Kapoulea, C. Psychalinos and A. S. Elwakil, "Single active element implementation of fractionalorder differentiators and integrators," Int. J. Electronics and Communications (AEUE), vol. 97, no. 12. pp. 615, 2018.
 G. Tsirimokou, C. Psychalinos and A. S. Elwakil, "Electronically tunable fully integrated fractionalorder resonator," IEEE Trans. Circuits & Syst.II, vol. 65, no. 2, pp. 166170, 2018.
 A. S. Elwakil, B. J. Maundy, M. ElAmien and L. Belostotski, "A fourquadrant current multiplier/divider cell with four transistors," Analog Integrated Circuits and Signal Processing, vol. 95, no. 1, pp. 173179, April, 2018.
 M. B. ElAmein, A. S. Elwakil and B. J. Maundy, "Wide range grounded nonlinear transconductor and its application as a frequency doubler," Int. J. Electronics Letters, vol. 6, no. 2, pp. 214219, 2018.
 P. Bertsias, C. Psychalinos, A. S. Elwakil and A. G. Radwan, "Highfrequency capacitorless fractionalorder CPE and FI emulator," Circuits Systems and Signal Processing, vol. 37, no. 7, pp. 26942713, 2018.
 B. J. Maundy, A. S. Elwakil and C. Psychalinos, "Simple MOSbased circuit designed to show pinched hysteresis behavior," Int. J. Circuit Theory & Applications, Wiley, vol. 46, no. 5, pp. 11231128, 2018.
 A. AlAli, A. S. Elwakil, B. J. Maundy and T. J. Freeborn, "Extraction of phase information from magnitudeonly bioimpedance measurements using a modified KramersKronig transform," Circuits Systems and Signal Processing, vol. 37, no. 8, pp. 36353650, August, 2018.
A. Abdelaty, A. S. Elwakil, A. G. Radwan, B. Maundy and C. Psychalinos, "Approximation of the fractionalorder Laplacian as a weighted sum of firstorder highpass filters," IEEE Trans. Circuits & Syst.II, vol. 65, no. 8, pp. 11141118, Aug. 2018. T. Bonny and A. S. Elwakil, "FPGA realizations of high speed switchingtype chaotic oscillators using compact VHDL codes," Nonlinear Dynamics, vol. 93, no. 2, pp. 819833, July, 2018. A. Allagui, A. S. Elwakil, M. Fouda and A. G. Radwan, "Capacitive behavior and stored energy in supercapacitors at power line frequencies," J. Power Sources, vol. 390, pp. 142147, June 2018. A. Roja, A. Allagui, A. S. Elwakil and H. Alawadhi, "True random bit generators based on current time series of contact glow discharge electrolysis," J. Applied Physics, vol. 123, no. 20, pp. 203301, 2018. C. Vastarouchas, I. Dimeas, C. Psychalinos and A. S. Elwakil, "Fractionalorder integrated circuits in control applications and biological modeling," Chapter 6 in Fractional Order Systems (Eds. A. Azar, A. Radwan and S. Vaidyanathan), Elsevier, pp. 163204, (doi.org/10.1016/B9780128161524.000066), 2018 S. Kapoulea, C. Psychalinos and A. S. Elwakil, "Minimization of spread of timeconstants and scaling factors in fractionalorder differentiator and integrator realizations," Circuits Systems and Signal Processing, Springer, vol. 37, 5647–5663, 2018 (awarded the 2018 Armen H. Zemanian Best Paper Award in the area of Circuits and Systems). A. Allagui, T. J Freeborn, A. S. Elwakil, M. E. Fouda, B. J. Maundy, A. G. Radwan, Z. Said, and M. A. Abdelkareem, "Review of fractionalorder electrical characterization of supercapacitors, J. Power Sources, vol. 400, no. 8, pp. 457467, 2018. M. I. Hussain, A. ElKeblawy and A. S. Elwakil, "Aluminum influence on Calotropis procera seedling growth, nutrient accumulation and electrochemical attributes," Flora  Morphology Distribution Functional Ecology of Plants, vol. 248, pp. 3442, 2018. A. Allagui, A. S. Elwakil, Z. Said, M. Abdelkareem and D. Zhang, "Bandpass filter and relaxation oscillator using electric doublelayer capacitor," ChemElectroChem, Wiley, vol. 5, no. 23, pp. 37933798, Dec. 2018. United States Provisional Patent Application, 62/656,088, BIOIMPEDANCE ANALYZER, Inventors: Abdulwadood Abdullah AlAli et al.
2017
 B. J. Maundy, S. Ozoguz, A. S. Elwakil and S. Gift, "The commonbase differential amplifier and applications revisited," Microelectronics J., vol. 63, pp. 819, May 2017.
 A. Allagui, A. S. Elwakil and T. J. Freeborn, "Supercapacitor reciprocity and response to linear current and voltage ramps," Electrochimica Acta, vol. 258, pp. 10811085, 2017.
 G. Tsirimokou, C. Psychalinos, A. S. Elwakil and K. N. Salama, "Experimental behavior evaluation of series and parallel connected constant phase elements," Int. J. Electronics and Communications (AEUE), vol. 74, pp. 512, April 2017.
 A. S. Elwakil, B. J. Maundy and C. Psychalinos, "On the pinched hysteresis behavior in a statecontrolled resistor," Int. J. Electronics and Communications (AEUE), vol. 74, pp. 171175, 2017.
 G. Tsirimokou, C. Psychalinos and A. S. Elwakil, Design of CMOS Analog Integrated FractionalOrder Circuits: Applications in Medicine and Biology, Springer, 111 pages, ISBN 9783319556321, (DOI: 10.1007/9783319556338), 2017.
 A. S. Elwakil, A. Agambayev, A. Allagui and K. N. Salama, "Experimental demonstration of fractionalorder oscillators of orders 2.6 and 2.7," Chaos Solitons & Fractals, vol. 96, pp. 160164, March 2017.
 M. Fouda, A. G. Radwan and A. S. Elwakil, Memristor and Inverse Memristor: Modeling, Implementation and Experiments, Chapter 15 in Advances in Memristors, Memristive Devices and Systems (Eds. S. Vaidyanathan and C. Volos), Studies in Computational Intelligence Series, Springer Verlag, Germany, pp. 371392, 2017.
 I. Dimeas, G. Tsirimokou, C. Psychalinos and A. S. Elwakil, "Experimental verification of fractionalorder filters using a reconfigurable fractionalorder impedance emulator," J. Circuits Systems and Computers, vol. 16, no. 9, pp. 1750142, 2017.
 A. S. Elwakil, A. G. Radwan, T. J. Freeborn, A. Allagui, B. J. Maundy and M. Fouda, "Lowvoltage commercial supercapacitor response to periodic linearwithtime current excitation: A case study," IET Circuits Devices & Syst., vol. 11, no. 3, pp. 189195, 2017.
 G. Tsirimokou, C. Psychalinos and A. S. Elwakil, "Fractionalorder electronically controlled generalized ﬁlters," Int. J. Circuit Theory & Applications, Wiley, vol. 45, no. 5, pp. 595612, May 2017.
 A. S. Elwakil, A. Allagui, T. J. Freeborn and B. J. Maundy, "Further experimental evidence of the fractionalorder energy equation in supercapacitors," Int. J. Electronics and Communications (AEUE), vol. 78, pp. 209212, August, 2017.
 B. J. Maundy, A. S. Elwakil, S. Ozoguz and H. Yildiz, "Minimal twotransistor multifunction filter design," Int. J. Circuit Theory & Applications, Wiley, vol. 45, pp. 14491466, Nov. 2017.
 T. J. Freeborn, A. S. Elwakil and B. J. Maundy, "Variability of Colemodel bioimpedance parameters using magnitudeonly measurements of apples from a twoelectrode configuration," Int. J. Food Properties, vol. 20, no. sup1, pp. S507S519, Taylor & Francis, (
 DOI:/10.1080/10942912.2017.1300810), 2017.
 A. Allagui, J. M. Ashraf, M. Khalil, M. Abdelkareem, A. S. Elwakil and H. Alawadhi, "All solidstate doublelayer capacitors using binderless reduced graphene oxide thin films prepared by bipolar electrochemistry," ChemElectroChem, Wiley, vol. 4, no. 8, pp. 20842090, August, 2017.
 A. AboBaker, L. Said, A. Madian, A. S. Elwakil and A. G. Radwan, "Experimental comparison of integer/fractionalorder electrical models of plant tissues," Int. J. Electronics and Communications (AEUE), vol. 80, pp. 19, Oct. 2017.
 P. Bertsias, C. Psychalinos, A. S. Elwakil and B. J. Maundy, "Currentmode capacitorless integrators and differentiators for implementing emulators of fractionalorder elements," Int. J. Electronics and Communications (AEUE), vol. 80, no. 10, pp. 94103, 2017.
 B. J. Maundy, A. S. Elwakil and C. Psychalinos, "CMOS realization of all positive pinched hysteresis loops," Complexity, article 7863095, (DOI:10.1155/2017/7863095), 2017.
 C. Psychalinos, A. S. Elwakil, A. Allagui and A. Tepljakov, "Special issue on recent advances in the design and applications of fractionalorder circuits and systems," Int. J. Electronics and Communications (AEUE), vol. 81, pp. 132135, Nov. 2017.
 B. J. Maundy, A. S. Elwakil and A. Elamien, "Oscillator with tunable phase capability," Electronics Letters, vol. 53, no. 23, pp. 15161518, Nov. 2017.
 A. Agambayev, S. Patole, M. Farhat, A. S. Elwakil, H. Bagci and K. N. Salama, "Tunable ferroelectric fractionalorder capacitors," ChemElectroChem, Wiley, vol. 4, no. 11, pp. 28072813, Nov. 2017. (DOI: 10.1002/celc.201700663).
 A. Allagui, Z. Said, M. A. Abdelkareem, A. S. Elwakil, M. Yang and H. Alawadhi, "DC and AC performance of graphite films supercapacitors prepared by contact glow discharge electrolysis," J. Electrochemical Society, vol. 164, no. 12, pp. A2539A2546, DOI: 10.1149/2.1161712jes, 2017.
2016
 A. S. Elwakil and B. J. Maundy, "Calculating output impedance in linear networks without source or load disconnect: The instantaneous output impedance," Int. J. Circuit Theory & Applications, Wiley, vol. 44, no. 1, pp. 98108, 2016.
 A. Allagui, M. Abdelkareem, H. Alawadhi and A. S. Elwakil, "Reduced graphene oxide thin film on conductive substrates by bipolar electrochemistry," Scientific Reports, Nature, 6, 21281, 2016.
 G. Tsirimokou, C. Psychalinos and A. S. Elwakil, "Switchedcapacitor fractionalstep Butterworth filter design," Circuits Systems and Signal Processing, Springer, vol. 35, no. 4, pp. 13771393, 2016.
 T. J. Freeborn, A. S. Elwakil and B. J. Maundy, "Approximating fractionalorder inverse Chebyshev lowpass filters," Circuits Systems and Signal Processing, Springer, vol. 35, no. 6, pp. 19731982, 2016.
 A. S. Elwakil, A. Allagui, B. J. Maundy and C. Psychalinos, "Low frequency oscillator using a supercapacitor," Int. J. Electronics and Communications (AEU), vol. 70, no. 7, pp. 970973, 2016.
 C. Psychalinos, A. S. Elwakil, A. G. Radwan and K. Biswas, "Guest Editorial: FractionalOrder Circuits and Systems: Theory, Design, and Applications," Circuits Systems and Signal Processing, Springer, vol. 35, no. 6, pp. 18071813, 2016.
 P. Ahmadi, B. Maundy, A. S. Elwakil, L. Belostotski and A. Madanayake, “A new 2nd–order allpass filter in 130nm CMOS,” IEEE Trans. Circuits & Syst.II, vol. 63, no.3, pp. 249253, March, 2016.
 T. J. Freeborn, A. S. Elwakil and B. Maundy, "Compact wide frequency range fractionalorder models of human body impedance against contact currents," Mathematical Problems in Engineering, Special Issue on Theory and Applications of Fractional Order Systems, vol. 2016, Article ID 4967937, DOI:10.1155/2016/4967937.
 A. S. Elwakil and B. J. Maundy, "Indirect realization of the imaginary resistor jR," Circuits Systems and Signal Processing, Springer, vol. 35, no. 7, pp. 26102615, 2016.
 M. E. Fouda, A. S. Elwakil, A. G. Radwan and B. J. Maundy, "Fractionalorder twoport networks," Mathematical Problems in Engineering, Special Issue on Theory and Applications of Fractional Order Systems, vol. 2016, Article ID 5976301, DOI:10.1155/2016/5976301.
 A. Allagui, A. Roja, T. Bonny, A. S. Elwakil and M. Abdelkareem, "Nonlinear timeseries analysis of current signal in cathodic contact glow discharge electrolysis," J. Applied Physics, 119 203303, 2016.
 B. Maundy, A. S. Elwakil and S. Gift, “On a class of cross coupled fully differential filters,” Int. J. Circuit Theory & Applications, Wiley, vol. 44, pp. 14251436, July 2016.
 C. Psychalinos, A. S. Elwakil, B. Maundy and A. Allagui, "Analysis and realization of a switched fractionalordercapacitor integrator," Int. J. Circuit Theory & Applications, Wiley, vol. 44, no. 11, pp. 20352040, 2016.
 M. Fouda, A. S. Elwakil, A. G. Radwan and A. Allagui, "Power and energy analysis of fractionalorder electrical energy storage devices," Energy, vol. 111, pp. 785792, Sept. 2016.
 G. Tsirimokou, C. Psychalinos, A. S. Elwakil and K. N. Salama "Experimental verification of on chip CMOS fractionalorder capacitor emulators," Electronics Letters, vol. 52, pp. 12981300, July 2016.
 G. Tsirimokou, C. Psychalinos, T. J. Freeborn and A. S. Elwakil, "Emulation of current excited fractionalorder capacitors and inductors using OTA topologies," Microelectronics J., vol. 55, pp. 7081, Sept. 2016.
 A. Allagui, A. S. Elwakil, B. Maundy and T. J. Freeborn, “Spectral capacitance of series and parallel combinations of supercapacitors,” ChemElectroChem, Wiley, vol. 3, no. 9, pp. 14291436, Sept. 2016.
 A. G. Radwan, B. J. Maundy and A. S. Elwakil, "Fractionalorder oscillators," Chapter 3 in Oscillator Circuits, Frontiers in Design, Analysis and Applications, Editor Yoshifumi Nishio, pp. 2549, IET, Dec. 2016.
 A. Allagui, A. S. Elwakil, T. J. Freeborn and B. J. Maundy, "Reevaluation of performance of electric doublelayer capacitors from constant current charge/discharge and cyclic voltammetry," Scientific Reports, Nature, 6:38568, Dec. 2016. (DOI: 10.1038/srep38568).
2015
 A. Allagui and A.
S. Elwakil,
"On the Nshaped conductance and hysteretic behavior of contact glow
discharge electrolysis," Electrochimica Acta, Elsevier, vol. 168, pp.
173177, 2015.
 A. S.
Elwakil and
B. J. Maundy, "Second order bandstop and bandpass filters using
transformers," Microelectronics J., Elsevier, vol. 46, no. 8,
pp. 690697, 2015.
 T. J. Freeborn,
A. S. Elwakil
and B. J. Maundy, "Fractionalorder models of supercapacitors,
batteries and fuel cells: A survey," Materials for Renewable
and Sustainable Energy, Springer, vol. 4, no. 3, pp. 17, 2015.
 M. Fouda, A.
S. Elwakil
and A. G. Radwan, "Pinched hysteresis with inversememristor
frequency characteristics in some nonlinear circuit elements," Microelectronics
J.,
Elsevier, vol. 46, no. 9, pp. 834838, 2015.
 G.
Tsirimokou, C. Psychalinos, A. S. Elwakil and A. Allagui, “Simple nonimpedancebased measuring technique for supercapacitors,” Electronics
Letters, vol. 51, no. 21, pp. 16991701, 2015.
 B. Maundy, A. S. Elwakil and A. Allagui, "Extracting the parameters of the singledispersion Cole bioimpedance model using a magnitudeonly method," Computers and Electronics in Agriculture, vol. 119, pp. 153157, 2015.
 G. Tsirimokou, C. Psychalinos and A. S. Elwakil, "Emulation of a constant phase element using operational transconductance amplifiers," Analog Integrated Circuits & Signal Processing, Springer, vol. 85, (3), pp. 413423, Dec. 2015.
2014
 A.
S. Elwakil and B.
J. Maundy, "Mapping of circuit variables into twoport network
variables in basic amplifier structures: identifying new
topologies," Int. J. Circuit Theory & Applications, vol. 42, no. 11, pp.
12031208, 2014.
 A.
S. Elwakil,
"Clockdriven chaotic pulsewidth generators: An overview and
demonstration of power supply attack," Int. J. Bifurcation
& Chaos, vol.
24, no. 6, pp. 14500791450086, June 2014.
 A.
S. Elwakil and B.
J. Maundy, "Single transistor active filters: What is possible and
what is not," IEEE Trans. Circuits & Syst.I, vol. 61, no. 9, pp.
25172524, Sept. 2014.
 T.
J. Freeborn, B. J. Maundy and A. S. Elwakil, "Extracting the
parameters of the doubledispersion Cole bioimpedance model without direct
impedance measurement," Medical & Biological Engineering
& Computing,
Springer, vol. 52, no. 9, pp. 749758, 2014.
 H.
Yu, A. S. Elwakil, L. Reyashko, Y. Wang and G. Chen, Guest Editorial, Special
Issue on ChaosFractals Theories and Applications, Mathematical
Problems in Engineering, (http://dx.doi.org/10.1155/2014/567281),
2014.
 T.
J. Freeborn, B. J. Maundy and A. S. Elwakil, "Approximated fractionalorder Chebychev lowpass filters," Mathematical Problems
in Engineering,
(http://dx.doi.org/10.1155/2014/832468), 2014.
 H.
Yildiz, A. Toker, A. S. Elwakil and S. Ozoguz, "MOSonly allpass
filters with extended operating frequency range,"Analog Integrated
Circuits & Signal Processing, Springer, vol. 81, no. 1, pp. 1722, 2014.
2013
 T.
J. Freeborn, B. J. Maundy and A. S. Elwakil, Fractional Step Analog
Filter Design, Book Chapter in `Analog/RF and Mixed Signal Circuit
Systematic Design`, Chapter 11, pp. 243267, Springer, 2013.
 A.
S. Elwakil,
A. Fouda and A. G. Radwan, "A simple model of doubleloop hysteresis
behavior in memristive elements", IEEE Trans. Circuits &
Syst.II, vol.
60, pp. 487491, August 2013.
 T.
J. Freeborn, B. Maundy and A. S. Elwakil, "Measurement of
supercapacitor fractionalorder model parameters from voltageexcited step
response," IEEE J. Emerging and Selected Topics in
Circuits & Systems, vol. 3, pp. 367376, Sept. 2013.
 T.
J. Freeborn, B. J. Maundy and A. S. Elwakil, "Cole impedance
extractions from the stepresponse of a current excited fruit
sample," Computers and Electronics in Agriculture, Elsevier, vol. 98, pp. 100108,
2013.
 A.
S. Elwakil,
B. J. Maundy, L. Fortuna and G. Chen, Guest Editorial, Special Issue on
FractionalOrder Circuits and Systems, IEEE J. Emerging and Selected
Topics in Circuits and Systems, vol. 3, no. 3, Sept. 2013.
2012
 B.
J. Maundy and A. S. Elwakil, "Extracting single dispersion ColeCole
impedance model parameters using an integrator setup," Analog
Integrated Circuits & Signal Processing, Springer, vol. 71, no. 1,
pp. 107110, 2012.
 B.
J. Maundy, A. S. Elwakil and S. Gift, "On the realization of
multiphase oscillators using fractionalorder allpass filters,"
Circuits Syst. & Signal Processing, Springer, vol. 31, pp. 317, Feb.
2012.
 A.
G. Radwan and A. S. Elwakil, "An expression for the voltage response of a
currentexcited fractance device based on fractionalorder trigonometric
identities," Int. J. Circuit Theory & Applications, vol. 40, pp.
533538, May 2012.
 T.
J. Freeborn, B. Maundy and A. S. Elwakil, "Least squares
estimation technique of ColeCole parameters from step response," Electronics
Letters, vol.
48, pp. 752754, June 2012.
 P.
Ahmadi, B. J. Maundy, A. S. Elwakil and L. Belostotski "High quality
factor asymmetricslope bandpass filters: A fractionalorder capacitor
approach," IET Circuits Devices & Syst., vol. 6, pp. 141210, April
2012.
 T.
J. Freeborn, B. J. Maundy and A. S. Elwakil, "Fractionalstep
TowThomas Biquad filters," IEICE Nonlinear Theory and its
Applications NOLTA, vol. 3, no. 3, pp. 357374, 2012.
2011
 B.
J. Maundy, A. S. Elwakil and T. Freeborn, "On the practical
realization of higherorder filters with fractional stepping," Signal
Processing,
Elsevier, vol. 91, pp. 484491, 2011.
 A.
S. Elwakil
and M. AlRidhawi, "All possible secondorder fourimpedance
twostage Colpitts oscillators," IET Circuits Devices & Syst. vol. 5, pp. 196202, May
2011.
 A.
S. Elwakil,
"Ring oscillator structures with explicitly separated
nonlinearity," Int. J. Circuit Theory & Applications, vol. 39, pp. 10791086,
Oct. 2011.
 T.
J. Freeborn, B. J. Maundy and A. S. Elwakil, "Numerical
extraction of ColeCole impedance parameters from step
response," IEICE Nonlinear Theory and its Applications NOLTA, vol. 2, no. 4, pp.
548561, Oct. 2011.
2010
 B. J. Maundy, A.
S. Elwakil
and S. Gift "On a multivibrator that employs a fractional
capacitor," Analog Integrated Circuits & Signal Processing, vol. 62, pp. 99103,
2010.
 A. S.
Elwakil
and K. N. Salama, "Higherdimensional models of crosscoupled
oscillators and application to design," J. Circuits Systems &
Computers,
vol. 19, pp. 787799, June 2010.
 A. S.
Elwakil,
"A nonconservative model of secondorder RC sinusoidal
oscillators," J. Circuits Systems & Computers, vol. 19, pp. 871877,
June 2010.
 A. S.
Elwakil
and M. A. Murtada "All possible canonical secondorder
threeimpedance classA and classB oscillators" Electronics
Letters,
vol. 46, pp. 748749, 2010.
 A. S.
Elwakil,
S. Ozoguz and K. N. Salama, "Sinusoidal oscillators with lower gain
requirements at higher frequencies based on an explicit tanh(x)
nonlinearity," Int. J. Circuit Theory & Applications, vol. 38, pp. 747760,
Sept. 2010.
 A. S.
Elwakil,
"Design of nonbalanced crosscoupled oscillators with no matching
requirements," IET Circuits Devices & Syst., vol. 4, pp. 365373,
Sept. 2010.
 A. S.
Elwakil
and B. J. Maundy, "Extracting the ColeCole impedance model
parameters without direct impedance measurement," Electronics
Letters,
vol. 46, pp. 13671368, Sept. 2010
 T. J. Freeborn,
B. J. Maundy and A. S. Elwakil, "Field programmable analog array implementation of fractional step filters," IET
Circuits Devices & Syst., vol. 4, pp. 514524, Nov. 2010.
 A. S.
Elwakil,
"Fractional order circuits and systems: An emerging interdisciplinary research area," IEEE Circuits & Systems Magazine, vol. 10, no. 4, pp.
4150, 2010.
 A. Abid, Q.
Nasir and A. S. Elwakil, "Implementation of an encrypted wireless
communication system using nested chaotic maps," Int. J.
Bifurcation & Chaos, vol. 20, pp. 40874096, Dec. 2010.
 A. S.
Elwakil
and B. J. Maundy, "On the twoport network analysis of common
amplifier topologies," Int. J. Circuit Theory & Applications, vol. 38, pp. 10871100,
Dec. 2010.
 A. S.
Elwakil,
"Motivating twoport network analysis through elementary and advanced
examples," Int. J. Electrical Engineering Education, vol. 47, pp. 404415,
Oct. 2010.
2009
 A. G. Radwan, A. S.
Elwakil
and A. M. Soliman "On the generalization of secondorder filters to
the fractionalorder domain," J. Circuits Systems & Computers, vol. 18, pp. 361386,
April 2009.
 A. S. Elwakil and K. N. Salama, "On
the nonlinear modeling of ring oscillators," J. Circuits Systems
& Computers,
vol. 18, pp. 681696, June 2009.
 A. G. Radwan, A. M. Soliman
and A. S. Elwakil, "On the stability of linear systems with
fractionalorder elements," Chaos Solitons & Fractals, vol. 40, pp. 23172328,
June 2009.
 A.
S. Elwakil,
"On the twoport network classification of Colpitts
oscillators," IET Circuits Devices & Syst., vol. 3, no. 5, pp. 223232,
Oct. 2009.
20072008
 A.
G. Radwan, A. M. Soliman and A. S. Elwakil, "1D
digitallycontrolled multiscroll chaos generator," Int. J.
Bifurcation & Chaos, vol. 17, pp. 227242, Jan. 2007.
 A.
G. Radwan, A. M. Soliman and A. S. Elwakil, "Fractionalorder
sinusoidal oscillators: Four practical circuit design examples," Int.
J. Circuit Theory & Applications, vol. 36, pp. 473492, June 2008.
 A.
S. Elwakil
and S. Ozoguz, "A system and circuit for generating
multibutterflies," Int. J. Bifurcation & Chaos, vol. 18, pp. 841844,
March 2008.
 A.
G. Radwan, A. S. Elwakil and A. M. Soliman "First order filters
generalized to the fractional domain," J. Circuits Systems &
Computers,
vol. 17, pp. 5566, Feb. 2008.
 A.
G. Radwan, A. S. Elwakil and A. M. Soliman, "Fractionalorder
sinusoidal oscillators: Design procedure and practical examples," IEEE
Trans. Circuits & Syst.I, vol. 55, pp. 20512063, Aug. 2008.
 A.
S. Elwakil and
A. M. Elkhouly "A study of equilibrium points and stability in a
nonlinear model of a phasecompensated operational amplifier," Circuits
Syst. & Signal Processing, Springer, vol. 27, pp. 781798, Oct. 2008.
20052006
 A. S.
Elwakil,
"A generic model for voltagecontrolled secondorder RC sinusoidal
oscillators," J. Circuits Syst. & Computers, vol. 14, pp. 297305,
April 2005.
 S. Ozoguz, T.
Abdelrahman and A. S. Elwakil, "Novel approximate squareroot domain
allpass filter with application to multiphase oscillators," Analog
Integrated Circuits & Signal Processing, vol. 46, no. 3, pp.
297301, 2006.
 A. S.
Elwakil,
"Explaining Hysteresis in Electronic Circuits," Int. J.
Electrical Engineering Education, vol. 43, pp. 252260, July 2006.
 A. S.
Elwakil,
"Explaining and eliminating latchup in a classical Wien oscillator
via nonlinear design," Analog Integrated Circuits & Signal
Processing,
vol. 48, pp. 239245, Sept. 2006.
 A. S.
Elwakil
and S. Ozoguz, "On the generation of higherorder chaotic oscillators
via passive coupling of two identical or nonidentical sinusoidal
oscillators," IEEE Trans. Circuits & Syst.I, vol. 53, pp. 15211532,
July 2006.
 A. S.
Elwakil
and S. Ozoguz, "Multiscroll chaotic attractors: The nonautonomous
approach," IEEE Trans. Circuits & Syst.II, vol. 53, pp. 862866,
Sept. 2006.
 S. Ozoguz, A.
S. Elwakil
and S. Ergun "Crosscoupled chaotic oscillators and application to
random bit generation," IEE Circuits Devices & Syst., vol. 153, pp. 506510,
Oct. 2006.
20032004
 A.
S. Elwakil
and S. Ozoguz, "Chaos in a pulseexcited resonator with self
feedback," Electronics Letters, vol. 39, pp. 831833, 2003.
 A.
S. Elwakil,
S. Ozoguz and M. P. Kennedy, "A four wing butterfly chaotic attractor
fom a fully autonomous system," Int. J. Bifurcation & Chaos, vol. 13, pp. 30933098,
2003.
 W.
M. Halalu and A. S. Elwakil, "Researchoriented junior/senior design
projects: An analog circuitdesign example," IEEE Trans. Education, vol. 47, pp. 9399, Feb.
2004.
 A.
S. Elwakil,
"Integratorbased circuitindependent chaotic oscillator
structure," Chaos, vol. 14, pp. 364369, 2004.
 S.
Ozoguz and A. S. Elwakil, "On the realization of circuitindependent
nonautonomous pulseexcited chaotic oscillator circuits," IEEE
Trans. Circuits & Syst.II, vol. 51, pp. 552556, 2004.
20012002
 A.
S. Elwakil
and M. P. Kennedy, "Construction of classes of circuitindependent
chaotic oscillators using passiveonly nonlinear devices," IEEE
Trans. Circuits & Syst.I, vol. 48, pp. 289307, 2001. (fast
moving front in the Field of Mathematics, January 2007 by Thomson
ScienceWatch)
 W.
Ahmed, R. Elkhazali and A. S. Elwakil, "Fractionalorder Wienbridge oscillator,"
Electronics Letters, vol. 37, pp. 11101112, 2001.
 A.
S. Elwakil,
"Nonautonomous pulsedriven chaotic oscillator based on Chua's
circuit," Microelectronics J., vol. 33, pp. 479486, 2002.
 A.
S. Elwakil,
S. Ozoguz and M. P. Kennedy, "Creation of a complex butterfly
attractor using a novel Lorenztype system," IEEE Trans. Circuits
& Syst.I,
vol. 49, pp. 527530, 2002.
 A.
S. Elwakil
and W. M. Ahmed, "On the necessary and sufficient conditions for
latchup in sinusoidal oscillators," Int. J. Electronics, vol. 89, pp. 197206,
2002.
 S.
Ozoguz, A. S. Elwakil and K. N. Salama, "Nscroll chaos generator
using nonlinear transconductor," Electronics Letters, vol. 38, pp. 685686,
2002.
 S.
Ozoguz, A. S. Elwakil and M. P. Kennedy, "Experimental verification
of the butterfly attractor in a modified Lorenz system," Int. J.
Bifurcation & Chaos, vol.12, pp. 16271633, 2002.
 A.
S. Elwakil,
K. N. Salama and M. P. Kennedy, "An equation for generating chaos and
its monolithic implementation," Int. J. Bifurcation & Chaos, vol. 12, pp. 28852895,
2002.
 A.
S. Elwakil,
and M. P. Kennedy, (2002) 'Design methodology for autonomous chaotic
oscillators' In: Chen, G. and Ueta, T (eds). Chaos in Circuits and
Systems.
London: Routledge (Book Chapter) DOI:10.1067/123456.
19992000
 A.
S. Elwakil
and A. M. Soliman, "Wien oscillators using current conveyors," Computers
& Electrical Engineering, Elsevier, vol. 25, pp. 4555, 1999.
 A.
S. Elwakil
and A. M. Soliman, "Mathematical models of the TwinT, Wienbridge
and family of minimum component electronic chaos generators with
demonstrative recurrence plots," Chaos Solitons & Fractals, vol. 10, pp. 13991411,
1999.
 A.
S. Elwakil
and A. M. Soliman, "Current conveyor chaos generators," IEEE
Trans. Circuits & Syst.I, vol. 46, pp. 393398, 1999.
 S.
A. Mahmoud, A. S. Elwakil and A. M. Soliman, "CMOS current feedback op
ampbased chaos generators using novel active nonlinear voltagecontrolled
resistors with odd symmetrical characteristics," Int. J.
Electronics,
vol. 86, pp. 14411451, 1999.
 A.
M. Eltawil and A. S. Elwakil, "Low voltage chaotic oscillator with an
approximate cubic nonlinearity," Int. J. Electr. Commun. (AEÜ), vol. 53, pp. 158160,
1999.
 A.
S. Elwakil
and M. P. Kennedy, "A family of Colpittslike chaotic
oscillators," J. Franklin Institute, vol. 336, pp. 687700,
1999.
 A.
S. Elwakil
and M. P. Kennedy, "Inductorless hyperchaos generator," Microelectronics
J.,
vol. 30, pp. 739743, 1999.
 A.
S. Elwakil
and M. P. Kennedy, "Threephase oscillator modified for chaos," Microelectronics
J., vol.
30, pp. 863867, 1999.
 A.
S. Elwakil
and M. P. Kennedy, "Chaotic oscillators derived from Saito's
doublescrew hysteresis oscillator," IEICE Trans. Fundamentals, vol. E82, pp. 17691775,
1999.
 A.
S. Elwakil
and M. P. Kennedy, "Chaotic oscillator configuration using a
frequencydependent negative resistor," J. Circuits Systems &
Computers,
vol. 9, pp. 229242, 1999.
 A.
S. Elwakil
and M. P. Kennedy, "Improved implementation of Chua's chaotic
oscillator using the current feedback op amp," IEEE Trans. Circuits
& Syst.I,
vol. 47, pp. 7679, 2000.
 A.
S. Elwakil
and M. P. Kennedy, "Chaotic oscillator configuration using a
frequencydependent negative resistor," Int. J. circuit Theory
& Applications, vol. 28, pp. 6976, 2000.
 A.
S. Elwakil
and M. P. Kennedy, "Novel chaotic oscillator configuration using a
diodeinductor composite," Int. J. Electronics, vol. 87, pp. 397406,
2000.
 A.
S. Elwakil
and M. P. Kennedy, "Chua's circuit decomposition: A systematic design
approach for autonomous chaotic oscillators," J. Franklin
Institute,
vol. 337, pp. 251265, 2000.
 A.
S. Elwakil
and M. P. Kennedy, "A lowvoltage lowpower chaotic oscillator
derived from a relaxation oscillator," Microelectronics J., vol. 31, pp. 459468,
2000.
 A.
S. Elwakil
and M. P. Kennedy, "A semisystematic procedure for producing chaos
from sinusoidal oscillators using diodeinductor and FETcapacitor
composites," IEEE Trans. Circuits & Syst.I, vol. 47, pp. 582590,
2000.
 A.
S. Elwakil
and M. P. Kennedy, "Chaotic oscillators derived from sinusoidal
oscillators using the current feedback op amp," Analog Integrated
Circuits and Signal Processing, vol. 24, pp. 239252, 2000.
 A.
S. Elwakil,
"A lowvoltage relaxation oscillator," Electronics Letters, vol. 36, pp. 12561257,
2000.
 A.
S. Elwakil
and M. P. Kennedy, "Systematic realization of a class of hysteresis
chaotic oscillators," Int. J. Circuit Theory & Applications, vol. 28, pp. 319334,
2000.
 A.
S. Elwakil
and M. P. Kennedy, "Generic RC realizations of Chua's circuit," Int.
J. Bifurcation & Chaos, vol. 10, pp. 19811985, 2000.
19971998
 A.
S. Elwakil
and A. M. Soliman, "A family of Wientype oscillators modified for
chaos," Int. J. Circuit Theory & Applications, vol. 25, pp. 561579,
1997.
 A. S.
Elwakil
and A. M. Soliman, "Current mode chaos generator," Electronics
Letters,
vol. 33, pp. 16611662, 1997.
 A.
S. Elwakil
and A. M. Soliman, "Chaos from a family of minimum component
oscillators," Chaos Solitons & Fractals, vol. 8, pp. 335356,
1997.
 A.
S. Elwakil
and A. M. Soliman, "Chaos from two modified oscillator configurations
using a current feedback op amp" Chaos Solitons & Fractals, vol. 8, pp. 389410,
1997.
 A.
M. Soliman and A. S. Elwakil, "A new generalized oscillator," Electronic
Engineering,
vol. 70, pp. 22,29, 1998.
 A.
S. Elwakil
and A. M. Soliman, "Two TwinT based op amp oscillators modified for
chaos" J. Franklin Institute, vol. 335B, pp. 771787, 1998.
 A.
S. Elwakil,
"Systematic realization of lowfrequency oscillators using composite
passiveactive resistors," IEEE Trans. Instrum. Meas., vol. 47, pp. 584586,
1998.
 A.
S. Elwakil
and M. P. Kennedy, "High frequency Wientype chaotic
oscillator," Electronics Letters, vol. 34, pp. 11611162, 1998.
 A.
S. Elwakil
and A. M. Soliman, "Two modified for chaos negative impedance
converter op amp oscillators with symmetrical and antisymmetrical
nonlinearities," Int. J. Bifurcation and chaos, vol. 8, pp. 13351346,
1998.
