1. Department of Mathematics, College of Science, Taif University, Taif, Saudi Arabia
2. Department of Mathematics, Faculty of Science, Zagazig University, Zagazig, Egypt
3. Department of Mathematics, Faculty of Science, Taibah University, Madinah, Saudi Arabia
4. Basic and Applied Science Institute Department, Arab Academy of Science and Technology, Alexandria, Egypt
5. National Committee for Mathematics, Academy of Scientific Research and Technology, Egypt
6. Basic and Applied Science Department, Arab Academy of Science and Technology, Heliopolis, Cairo, Egypt