Comment on "Parameter identification and synchronization of fractional-order chaotic systems" [Commun Nonlinear Sci Numer Simulat 2012;17: 305-16]. - Sajad Jafari; Seyed Mohammad Reza Hashemi Golpayegani; Mansour R. Darabad (Commun. Nonlinear Sci. Numer. Simul., 2013)