1. Department of Applied Mathematics, Nanjing Forestry University, Nanjing 210037, China
2. Department of Mathematics, City University of Hong Kong, Hong Kong
3. School of Mathematics, Southeast University, Nanjing 210096, China
4. Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
5. College of Mathematics and Systems Science, Shandong University of Science and Technology, Qingdao 266590, China