[1] Taibah Univ, Coll Sci, Dept Math, Al Madinah Al Munawarah, Saudi Arabia
[2] Mansoura Univ, Fac Sci, Dept Math, Mansoura 35516, Egypt
[3] Imam Abdulrahman Bin Faisal Univ, Coll Sci & Humanities, Dept Math, Dammam, Saudi Arabia
[4] Firat Univ, Fac Sci, Dept Math, TR-23119 Elazig, Turkey
[5] POB 12020, City Jubail, Saudi Arabia