1. Faculty of Computer Science and Information Technology, Northern Border University, Rafha, Kingdom of Saudi Arabia
2. Faculty of Sciences, University of Tunis El-Manar, Tunis, Tunisia
3. Mathematics Department, Faculty of Sciences, University of Tunis El-Manar, Tunis, Tunisia
4. Applied math laboratory, faculty of exact sciences, university of Bejaia, Algeria
5. Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia