1. Department of Mathematics, College of Science, Jouf University, P.O. Box: 2014, Sakaka, Saudi Arabia
2. Department of Mathematics, College of Sciences and Arts ArRas, Qassim University, Buraydah, Saudi Arabia
3. University of Sfax, Faculty of Sciences of Sfax, Department of Mathematics, Route Soukra, BP 1171, 3000 Sfax, Tunisia