Affiliation: | 1. College of Mathematic and Information Science, Shandong Institute of Business and Technology, Yantai 264005, China;2. School of Mathematical Sciences, South China Normal University, Guangzhou 510631, China;1. Department of Mathematics and Physics, Hefei University, Hefei 230601, China;2. School of Mathematics and Statistics, Huazhong University of Science and Technology, Wuhan 430074, China |