Mahmoud, S. A., A. S. Elwakil, and A. M. Soliman,
"CMOS current feedback op amp-based chaos generators using novel active nonlinear voltage controlled resistors with odd symmetrical characteristics",
International Journal of Electronics, vol. 86, no. 12: London: Taylor & Francis,[1965-, pp. 1441–1452, 1999.
Abstract
Elwakil, A. S., and A. M. Soliman,
"Mathematical Models of the Twin-T, Wien-bridgeand Family of Minimum Component Electronic ChaosGenerators with Demonstrative Recurrence Plots",
Chaos, Solitons & Fractals, vol. 10, no. 8: Elsevier, pp. 1399–1412, 1999.
Abstract