Affiliation: | 1. School of Mathematics and Statistics, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. School of Mathematics and Information Sciences, Nanchang Hangkong University, Nanchang 330063, PR China;1. School of Science, Huzhou University, Huzhou 313000, China;2. School of Mathematical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia;3. School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210000, China |