1. Higher Education Department, Govt of the Punjab, Lahore 54000, Pakistan
2. Department of Statistics, Quaid-i-Azam University, Islamabad 45320, Pakistan
3. Department of Mathematical Sciences, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
4. Department of Mathematics, Namal University, Talagang Road, Mianwali 42250, Pakistan
5. Department of Mathematics, College of Science and Humanities in Al-Aflaj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11912, Saudi Arabia
6. Department of Mathematics, Faculty of Science, Damietta University, New Damietta 34517, Damietta, Egypt
7. Federal Urdu University of Arts Science and Technology, Islamabad, Pakistan