1. Department of Mathematics, Faculty of Science, King Khalid University , Abha 61413 , Saudi Arabia
2. Department of Basic Sciences, General Administration of the Preparatory Year, King Faisal University , Al-Ahsa, 31982 , Saudi Arabia
3. Department of Computer Science and Mathematics, Lebanese American University , Beirut , Lebanon
4. Department of Mathematics, College of Science, Jazan University , Jazan , Saudi Arabia
5. Department of Mathematics, Faculty of Science, AL-Azhar University , Assiut , Egypt