1. Department of Mathematics, University of Sargodha, Sargodha, Pakistan
2. Department of Mathematics, University of Lahore, Lahore, Pakistan
3. Department of Mathematics and Statistics, College of Science, King Faisal University, Hafuf, Al Ahsa 31982, Saudi Arabia
4. Department of Mathematics, College of Science and Humanity, Prince Sattam bin Abdulaziz University, Sulail, Al-Kharj 11942, Saudi Arabia