1. Department of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi 43600, Selangor, Malaysia
2. Department of Mathematics, Faculty of Science, Qassim University, Qassim 52571, Saudi Arabia
3. Department of Mathematics, Faculty of Science, Sakarya University, Serdivan, Sakarya 54050, Turkey
4. Department of Computer Science and Mathematics, Lebanese American University, Byblos, Lebanon
5. Department of Mechanics and Mathematics, Western Caspian University, Baku 1001, Azerbaijan
6. Department of Mathematics and Computer Science, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi Arabia
7. Department of Mathematical Sciences, Federal Urdu University of Arts, Science and Technology, Gulshan-e-Iqbal, Karachi 75300, Pakistan
8. Department of Mathematics and Social Sciences, Sukkur IBA University, Sukkur 65200, Pakistan
9. Department of Mathematics, Edinburgh School and College, Edinburgh, UK
10. Department of Mathematics, Faculty of Science, Islamic University of Madinah, Madinah 42351, Saudi Arabia