Affiliation: | 3. Department of Mathematics, Nanchang University, Nanchang, 330031, Jiangxi Province, P.R. China 2. School of Mathematics and Physics, China University of Geosciences, Wuhan, 430074, Hubei Province, P.R. China 1. College of Information Science and Technology, Wuhan University of Science and Technology, Wuhan, 430081, Hubei Province, P.R. China
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