“…During the last decade, much progress has been made in the field of observer design, and many observer-based adaptive fuzzy control schemes have been proposed for uncertain nonlinear systems [20,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. Among them [27, 31-33, 35, 38] are for SISO nonlinear systems, [20, 28-30, 34, 39, 42, 43] are for MIMO nonlinear systems, and [40,41] are for strick feedback nonlinear systems.…”