1. Center for Applied Mathematics, Guangzhou University, Guangzhou 510006, China
2. College of Mathematics and Information Sciences, Guangzhou University, Guangzhou 510006, China
3. College of Science, Xi'an University of Science and Technology, Xi'an 710054, China
4. School of Mathematics and Informational Technology, Yuncheng University, Yuncheng 044000, China
5. College of Mathematics and Statistics, Xinyang Normal University, Xinyang 464000, China