1. School of Mathematical Sciences, Capital Normal University, Beijing 100048, People’s Republic of China
2. Department of Mathematics and Information Science, Zhengzhou University of Light Industry, Zhengzhou, Henan 450002, People’s Republic of China
3. Hunan Key Laboratory for Computation and Simulation in Science and Engineering, School of Mathematics and Computational Science, Xiangtan University, Xiangtan 411105, China