1. Department of Mathematics, University of Karachi, Karachi 75270, Pakistan
2. College of Computer Science and Information System, Institute of Business Management, Karachi 75190, Pakistan
3. Department of Sciences and Humanities, National University of Computer and Emerging Sciences, Karachi 75030, Pakistan
4. Department of Mathematics, Government College University Lahore, Lahore 54000, Pakistan
5. Department of Mathematics, University of Balochistan, Quetta 87300, Pakistan