1. Department of Mathematics, College of Science, Taif University, P. O. Box 11099, Taif 21944, Saudi Arabia
2. Department of Physics and Engineering Mathematics, Faculty of Electronic Engineering, Menoufia University, Menouf 32952, Egypt
3. Department of Mathematics, Faculty of Science, Sohag University, Sohag 82524, Egypt
4. Department of Mathematics, Faculty of Science, Al-Azhar University, Nasr City, Egypt
5. Department of Mathematics, Faculty of Science, South Valley University, Qena 83523, Egypt
6. Department of Computer Science, Faculty of Computers and Information, Luxor University, Luxor, Egypt