1 | Mansoura University, Faculty of Science, Department of Mathematics, Mansoura |
2 | Damietta University, Faculty of Science, Department of Mathematics, Damietta |
3 | King Abdulaziz University, Faculty of Science, Department of Mathematics, Jeddah, Saudi Arabia,
Kafrelsheikh University, Faculty of Science, Department of Mathematics, Kafrelsheikh, Egypt |