| Affiliation: | 1. Department of Mathematics, China University of Mining and Technology, Xuzhou 221116, PR China;2. School of Mathematics and Statistics, Central South University, Changsha, Hunan 410083, PR China;1. State Key Laboratory of Tunable Laser Technology Research, Institute of Optic-Electronics, Harbin Institute of Technology, Harbin 150001, China;2. College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua 321004, China;3. Nature Science Research Center of Science and Technology, Harbin Institute of Technology, Harbin 150001, China |
