Comments on Design of sliding mode controller for a class of fractional-order chaotic systems [Commun Nonlinear Sci Numer Simulat 17 (2012) 356-366]

Some comments on the paper [Yin C, Zhong S-M, Chen W-F. Design of sliding mode controller for a class of fractional-order chaotic systems. Commun Nonlinear Sci Numer Simulat 17 (2012) 356-366] are pointed out in this note. Besides, recently introduced fractional-order Lyapunov stability theorems are used to prove the finite-time occurrence of the sliding motion. (C) 2011 Elsevier B.V. All rights reserved.