1. Laboratoire d'Analyse Non linéaire et Mathématiques Appliquées, Department of Mathematics, Faculty of Sciences, University of Tlemcen, Algeria
2. Institut Camille Jordan, UMR 5208 CNRS, University Lyon 1, Villeurbanne 69622, France
3. Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St, Moscow 117198, Russian Federation