1. School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
2. Department of Mathematics, Islamia College Peshawar, Peshawar, Pakistan
3. Department of Mathematics, Huzhou University, Huzhou 313000, China
4. Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science & Technology, Changsha 410114, China