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