1. Department of Mathematics, Faculty of Science, New Valley University, Al-Kharga, Al-Wadi Al-Gadid, Egypt
2. Department of Mathematics, Faculty of Science, Northern Border University, Arar, Saudi Arabia
3. Department of Information Technology, Fanshawe College, London, ON, Canada
4. Sohag Technical Industrial Institute, Ministry of Higher Education, Egyptian Technical College, Sohag, Egypt