First Author:   Coralia Quintero Rojas University of Guanajuato coralia@ugto.mx   Campus Guanjuato, DCEA, DEF, Fraccionamiento 1, Col. El Establo S/N Guanajuato, 36250, Mexico   (+52)4737352900(Phone) (+52)4737352900(Fax) Second Author: Sébastien Ménard Université du Maine sebastien.menard@univ-lemans.fr