Iqbal, S., F. Sarwar, S. M. Raza, A. Rehman, and Y. Z. Jafri. “An Aperiodic Stable Chaos With Lyapunov Exponents in Time Series”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 15, no. 1, Jan. 2016, pp. 282-9, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1305.