1. Department of Mathematics, COMSATS University Islamabad, Park Road, Tarlai Kalan 45550, Islamabad, Pakistan
2. Balochistan University of Information Technology Engineering and Management Science, Quetta, Balochistan, Pakistan
3. Department of Mathematics, Sardar Bahadur Khan Women University, Quetta, Balochistan, Pakistan
4. University of Central Punjab Islamabad Campus, Islamabad, Pakistan