1. Department of Mathematics, COMSATS University Islamabad, Islamabad Campus, Chak Shehzad, Islamabad 44000, Pakistan
2. College of Science, Inner Mongolia University of Technology, Hohhot 010051, China
3. Department of Mathematics, College of Sciences, King Khalid University, Abha 61413, Saudi Arabia
4. Mathematical Modelling and Applied Computation Research Group (MMAC), Department of Mathematics, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia