Affiliation: | a Department of Statistical Science, Zhongshan University, Guangzhou, China b Departamento de Control Automatico,CINVESTAV-IPN, Mexico D.F. 07360, Mexico c Seccion de Computacion, Departamento de Ingenieria Electrica, CINVESTAV-IPN, Mexico D.F. 07360, Mexico d Departamento de Matematicas, CINVESTAV-IPN, Mexico D.F. 07360, Mexico |