1. Department of Mathematics, Hazara University, Mansehra, Khyber Pakhtunkhwa, Pakistan
2. Department of Mathematics and Sciences, Prince Sultan University, Riyadh, Saudi Arabia
3. Department of Mathematics and Applied Mathematics, School of Science and Technology, Sefako Makgatho Health Sciences University, Ga-Rankuwa, South Africa
4. Department of Mathematics, College of Science and Arts, Qassim University, Al Badayea, Saudi Arabia