1. LIA/CERI, University of Avignon, Agroparc, BP 1228, 84911 Avignon, France
2. University of Castilla La Mancha (UCLM), 02071 Albacete, Spain
3. Engineering Division, ITAM, 01080 Mexico, DF, Mexico
4. L-IR2M, Faculty of Sciences and Techniques, Hassan 1st University, Settat, Morocco