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Guizhou Coll Finance & Econ, Sch Math & Stat, Guiyang 550004, Peoples R China
Hunan Inst Engn, Fac Sci, Xiangtan 411004, Peoples R China
Jishou Univ, Zhangjiajie Coll, Dept Math, Zhangjiajie 427000, Peoples R China Guizhou Coll Finance & Econ, Sch Math & Stat, Guiyang 550004, Peoples R China