1. Department of Humanities and Basic Sciences, Military College of Signals (MCS), National University of Sciences and Technology, Islamabad, Pakistan
2. Mathematics Department, Faculty of Science, Taibah University, Al-Madinah Al-Munawarah, Kingdom of Saudi Arabia
3. Department of Mathematics and Statistics, The University of Lahore, Lahore, Pakistan
4. Department of Mathematics, University of Narowal, Narowal, Pakistan