| Affiliation: | 1. Department of Mathematics, Faculty of Science, King Khalid University, Abha 62529, Saudi Arabia;2. Department of Mathematics, Faculty of Science, South Valley University, Qena 83523, Egypt;3. Department of Mathematics, College of Science and Arts, Qassim University, Al Mithnab, Saudi Arabia;4. Department of Mathematics and Computer Science, Faculty of Science, Port Said University, Port Said, Egypt;5. Department of Mathematics, Faculty of Science, Zagazig University, Zagazig, Egypt |
