1. Department of Applied Mathematics and Computer Science, Faculty of Sciences and Technics, Hassan First University, Km 3, Route of Casablanca, Settat, POB: 577, Morocco
2. Department of Applied Mathematics and Computer Science, Faculty of Sciences and Technics, Hassan First University, Laboratory of Mathematics, Computing and Engineering Sciences, Km 3, Route of Casablanca, Settat, POB: 577, Morocco