1. Department of Mathematics, Institute of Numerical Sciences, Gomal University D. I. Khan, Dera Ismail Khan, Pakistan
2. Department of Mathematics, Riphah Institute of Computing and Applied Sciences, Riphah International University Lahore, Lahore 54000, Pakistan
3. Department of Mathematics, Faculty of Ocean Engineering Technology and Informatics, University of Malaysia Terengganu, Kuala Nerus 2103, Malaysia