Affiliation: | 1.Department of Applied Mathematics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, China ;2.School of Mathematical Sciences, Beijing Normal University, Laboratory of Mathematics and Complex Systems (BNU), Ministry of Education, Beijing, 100875, China ;3.School of Mathematics and Statistics, Wuhan University, Wuhan, 430072, China ;4.School of Mathematics and Information Science, Henan Polytechnic University, Jiaozuo, 454003, China ; |