1. Department of Information Systems, University of Management and Technology, Lahore 54770, Pakistan
2. Department of Computer Science and Informatics, London South Bank University, UK
3. Department of Mathematical Sciences, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
4. Department of Mathematics, University of Management and Technology, Lahore 54770, Pakistan