1. Laboratory of Fundamental and Applicable Mathematics of Oran (LMFAO), Department of Mathematics, Faculty of Exact and Applicable Sciences, University of Oran 1, Algeria
2. Laboratory of Fundamental and Applicable Mathematics of Oran (LMFAO), Department of Mathematics, Faculty of Sciences, University of Mostaganem, Algeria
3. Department of Mathematics, Faculty of Sciences, University of Tlemcen, Algeria