1. Department of Mathematics, Faculty of Science, Taibah University, Al-Madinah, Saudi Arabia
2. Department of Mathematics, Faculty of Science, Taibah University, Al-Madinah, KSA, Saudi Arabia
3. Department of Mathematics, Faculty of Science, Tanta University, Tanta, Egypt
4. Mathematics Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt