“…Since Ott et al firstly proposed the method of chaos control in 1990 [1], chaos control has attracted great attention in recent years and lots of successful methods have been reported , such as feedback control [7,8], impulsive control [9,10], backstepping method [11], adaptive control [12][13][14][15], adaptive fuzzy backstepping technique [16], adaptive sliding mode control [17,18], neural network technique [19], and H ∞ synchronization [20][21][22].…”