1. Department of Mathematics, National University of Computer and Emerging Sciences, B-Block Faisal Town, Lahore; and Department of Mathematics, University of Management and Technology, C-II Johar Town, Lahore, Pakistan
2. Department of Mathematics, Government College University Lahore, Katchery Road, Lahore, Pakistan; and Department of Mathematics, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
3. Department of Mathematics, National University of Computer and Emerging Sciences, B-Block Faisal Town, Lahore; and Department of Mathematics, University of Sharjah, Sharjah, United Arab Emirates