1. Punjab Tianjin University of Technology, Lahore, Pakistan
2. Department of Mathematics and Statistics, The University of Lahore, Lahore Campus, Lahore, Pakistan
3. Department of Mathematics, University of Management and Technology, Lahore, Pakistan
4. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Ga-Rankuwa, Pretoria, Medunsa-0204, South Africa
5. Department of Mathematics, Ardabil Branch, Islamic Azad University, Ardabil, Iran