1. Mathematics Department, Faculty of Science, Al-Azhar University, Nasr-City, Cairo, Egypt
2. Department of Mathematics, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
3. Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia
4. Faculty of Engineering, MTI University, Cairo, Egypt