1. Laboratory of Algebra, Analysis and Applications (L3A), Department of Mathematics and Computer Science, Faculty of Sciences Ben M’sik, Hassan II University of Casablanca, P.B 7955 Sidi Othmane, Casablanca, Morocco, E-mail: hbassou@gmail.com
2. Laboratory of Algebra, Analysis and Applications (L3A), Department of Mathematics and Computer Science, Faculty of Sciences Ben M’sik, Hassan II University of Casablanca, P.B 7955 Sidi Othmane, Casablanca, Morocco, E-mail: sabarsaw@gmail.com
3. Laboratory of Algebra, Analysis and Applications (L3A), Department of Mathematics and Computer Science, Faculty of Sciences Ben M’sik, Hassan II University of Casablanca, P.B 7955 Sidi Othmane, Casablanca, Morocco, E-mail: aamrimohamed82@gmail.com