1. Department of Mathematical Sciences, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia
2. Department of Mathematics and Statistics, University of Haripur, Haripur, Pakistan
3. Department of Statistics, University of Peshawar, Peshawar, Pakistan
4. Department of Mathematics, Faculty of Science, Tanta University, Tanta, Egypt
5. Department of Mathematical Science, IUST, Awantapora, Kashmir, India