1. Department of Mathematics, College of Sciences and Arts in Gurayat, Jouf University, Sakakah, Saudi Arabia
2. Faculty of Sciences, University of Sfax, Sfax, Tunisia
3. Faculty of Science and Arts at Belqarn, Department of Mathematics, University of Bisha, Sabt Al-Alaya, Saudi Arabia
4. Faculty of Sciences, University of Gafsa, Gafsa, Tunisia