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An extremely simple 4-D chaotic oscillator is presented. It contains a single opamp, two LC circuits and a diode used as a nonlinear device. The chaotic oscillations have been characterised using the correlation dimension of the strange attractor, the Lyapunov exponents and the Lyapunov dimension. The dimensions are found to be >3.
Tamaševičius et al. (Thu,) studied this question.