1. Department of Mathematics, Faculty of Science, Islamic University of Madinah, Madinah 42351, Saudi Arabia
2. Mathematics Department, Al-Qunfudah University College, Umm Al-Qura University, Mecca 24382, Saudi Arabia
3. Department of Mathematics, Quaid-i-Azam University, Islamabad 45320, Pakistan
4. Department of Mathematics, National University of Modern Languages Islamabad, Multan Campus, Multan 59300, Pakistan
5. Department of Computing and Mathematical Sciences, Cameron University, Lawton, OK 73505, USA
6. Department of Mathematics, University of Houston, Houston, TX 77204, USA