1. Anwer Khurshid:
Department of Mathematical and Physical Sciences, College of Science and Arts, University of Nizwa, Birkat Al Mouz, Nizwa, Sultanate of Oman
2. Ehtisham Hussain:
Department of Statistics, University of Karachi, Karachi, Pakistan
3. Masood-Ul-Haq:
Department of Mathematical Sciences, Usman Institute of Technology, Karachi, Pakistan