1. Department of Mathematics, University of Wah, Wah Cantt, Pakistan
2. Department of Mechanics and Engineering Sciences, Peking University, Beijing, People’s Republic of China
3. Mathematical Modelling and Applied Computation Research Group (MMAC), Department of Mathematics, King Abdulaziz University, Jeddah, Saudi Arabia
4. Department of Mathematics and Statistics, Riphah International University I-14, Islamabad, Pakistan
5. Department of Mathematics, COMSATS University Islamabad, Sahiwal, Pakistan