1. Department of Mathematics and Computer Science, University of Ghardaia, BP 455 Ghardaia 47000, Algeria
2. Department of Statistics and Operations Research, College of Sciences, King Saud University, Riyadh 11451, Saudi Arabia
3. ENSIIE, University of Evry-Val-d'Essonne, 1 square de la Résistance 91025 Évry-Courcouronnes cedex, France
4. Department of Mathematics, Faculty of Sciences of Sfax, University of Sfax, Tunisia