1. University of Tlemcen, Laboratory of Analysis and Control of Partial Differential Equations of Sidi Bel Abbes-Algeria, Tlemcen, Algeria
2. Qassim University, College of Science, Departement of Mathematics, B.O. 6644, Buraidah 51 452, Saudi Arabia
3. Higher School of Management-Tlemcen, Laboratory of Analysis and Control of Partial Differential Equations of Sidi Bel Abbes-Algeria, Tlemcen, Algeria