1. Department of Mathematics, Higher Education Department, Punjab, Lahore, Pakistan
2. Department of Sciences and Humanities, National University of Computer and Emerging Sciences, Lahore Campus, Pakistan
3. Department of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia
4. Department of Mathematics, Riphah International University Faisalabad Campus, Pakistan
5. Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan