1. College of Computer Science and Technology, ZheJiang University of Technology, HangZhou, China
2. Department of Mathematics, Quaid-I-Azam University, Islamabad, Pakistan
3. Nonlinear Analysis and Applied Mathematics (NAAM) Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
4. Department of Computer Science, Brunel University, London, UK