1. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
2. Department of Mathematics and Statistics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
3. Department of Mathematics and Information Science, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
4. Department of Mathematics, The Women University, Multan, Pakistan