Document Type : Research Paper
Authors
1 Department of Mathematics, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P.R. China
2 Department of Mathematics, Hunan University of Science and Technology Xiangtan, Hunan 411201, P. R. China
3 Department of Mathematics and Applied Mathematics, Huaihua University, Huaihua, 418000, P. R. China
Abstract
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