1. School of Mathematical Sciences, Guizhou Normal University, Guiyang, Guizhou 550001, China
2. School of Mathematical Sciences and Fujian Provincial Key Laboratory on Mathematical Modeling & High Performance Scientific Computing, Xiamen University, Xiamen, Fujian 361005, China
3. South China Research Center for Applied Mathematics and Interdisciplinary Studies, School of Mathematical Sciences, South China Normal University, Guangzhou 510631, China