Affiliation: | 1. School of Mathematics Science, Guangxi Teachers Education University, Guangxi, 530001, Nanning, People’s Republic of China 2. Department of Mathematics, Xiamen University, Xiamen, 310065, Fujian, People’s Republic of China 3. Department of Information and Communication Engineering, The University of Electro-Communications, 1-5-1 Chofugaoku, Chofu, Tokyo, 182-8585, Japan
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