“…In 1992 another approach, based on delayed feedback control, was presented for stabilizing unstable periodic orbits of continuous time chaotic systems, called Pyragas method [4]. In recent years, many nonlinear techniques for chaos control were used, such as feedback linearization [5][6][7], sliding mode control [8][9][10], Lyapunov based control [11][12][13] and fuzzy system based control [14][15][16]. In all of the mentioned methods the chaotic system has a deterministic differential equation; there is no random parameter or random excitation on the system governing equation.…”