1. Sciences Faculty, CS DepartmentUniversity of BLIDA1 ‐ LRDSIAlgeria
2. Université Bretagne Sud ‐ IRISAFrance
3. Present address: Nicolas Belloir, IRISAUniversité de Bretagne‐Sud, Campus de Tohannicbâtiment ENSIBS, Rue Yves Mainguy, BP 573, 56017 Vannes cedex France
4. CREC St‐CyrMilitary Academy of St Cyr CoetquidanFrance
5. University of Bouira ‐ LIMPAFAlgeria