1. Department of Mathematics and Statistics, Riphah International University I-14, Islamabad, Pakistan
2. Deperament of Mathematics, Yildiz Technical University, Faculty of Arts and Science, Esenler, Istanbul, Turkey
3. Department of Mathematics and Statistics, International Islamic University Islamabad, Pakistan
4. Faculty of Organizational Sciences, University of Belgrade, Belgrade, Serbia
5. Department of Mathematics and Statistics, American University of the Middle East, Egaila, Kuwait