1. School of Mathematics, Minhaj University Lahore, Lahore, Pakistan
2. Department of Mathematics, Lahore Garrison University, Lahore, Pakistan
3. Mathematics Department, College of Science, Jouf University, P.O. Box: 2014, Sakaka, Saudi Arabia
4. University of Engineering and Technology (RCET), Lahore, Pakistan
5. Department of Mathematics, University of Management and Technology, Lahore 54770, Pakistan