1. School of Mathematics and Statistics, Central South University, Changsha, China
2. Department of Computer Science, Faculty of Computers and Informatics, Zagazig University, Zagazig, Egypt
3. Department of Mathematics, Faculty of Science, Suez Canal University, Ismailia, Egypt
4. Department of Computer Science, College of Computer Engineering and Sciences, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia