1. Laboratoire d'Analyse Non Linéaire et Mathématiques Appliquées Université Abou Bakr Belkaïd Tlemcen Algeria
2. Faculty of Exact Sciences and Informatics, Mathematics Department Hassiba Benbouali University Chlef Algeria
3. Department of Mathematics and Informatics University of Belhadj Bouchaib Ain Temouchent Ain Temouchent Algeria