1. Department of Mathematical Sciences, Universiti Teknologi Malaysia, Sakudai, Malaysia
2. Department of Mathematics, University of Hafar Al-Batin, Hafar Al-Batin, Saudi Arabia
3. Department of Statistics, National College of Business Administration and Economics, Lahore, Pakistan
4. Department of Chemical Engineering, University of Hafr Al Batin, Hafar Al Batin, Saudi Arabia
5. Department of Mathematics and Statistics, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia