“…Of those so-called universal approximators, neural networks and fuzzy functions have been widely employed for approximation-based adaptive control of some classes of uncertain nonlinear dynamical systems. Some references that focus on MIMO nonlinear systems are: (i) multivariable adaptive control using neural networks: Deng and Li (2005), Fu and Chai (2007), Ge, Zhang, and Lee (2004), Henriques and Dourado (1999), Jin, Nikiforuk, and Gupta (1994), Narendra and Mukhopadhyay (1994), Ordonez and Passino (1999), Salahshoor and Kamalabady (2010), Selmic and Lewis (2000), Trunov and Polycarpou (2000), Wang, Chien, Leu, and Lee (2010), Wang and Huang (2005), Yang, Yang, and Sun (2012); and (ii) multivariable adaptive control using fuzzy system models: Cheng and Chien (2006), Chiu (2006), Johansen (1994), Labiod and Guerra (2007), Liu, Tong, and Li (2011), Moustakidis, Rovithakis, and Theocharis (2008), Ordonez and Passino (1999), Rong, Sundararajan, Saratchandran, and Huang (2007), Tong, Li, and Shi (2012), Trebi-Ollennu and White (1997), and Zhang, Cai, and Bien (2000).…”