1. Equipe de Recherche en Mathématiques Appliquées, Technologies de l’Information et de la Communication, Polydisciplinary Faculty of Khouribga, BP. 145, University Sultan Moulay Slimane, Morocco
2. Laboratory of Analysis, Algebra and Applications, Faculty of Sciences Ben M’sik BP. 7955, Sidi Othmane, Universite Hassan II Casablanca, Casablanca, Morocco