Affiliation: | 1. Department of Mathematics, Honghe University, Mengzi 661199, China;2. Department of Mathematics, Sichuan University, Chengdu 610064, China;3. Chengdu Businessbigdata Tech. Corp. Ltd, Chengdu 610093, China;4. Department of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China |