Document Type : Research Paper
Authors
1 College of Mathematics and Statistics, Chongqing University, Chongqing, 401331, P.R. China, and College of Science, Shihezi University, Shihezi, Xinjiang, 832003, P. R. China.
2 College of Mathematics and Statistics, Chongqing University, Chongqing, 401331, P.R. China.
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