1. Department of Mathematics, Faculty of Science, Cairo University, Giza, Egypt
2. Department of Basic Science, Faculty of Engineering at October 6 University, Egypt
3. Firat University, Science Faculty, Department of Mathematics, 23119 Elazig, Turkey
4. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
5. Department of Computer Engineering, Biruni University, Istanbul, Turkey
6. Federal University Dutse, Science Faculty, Department of Mathematics, 7156 Jigawa, Nigeria