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NE Normal Univ, Sch Math & Stat, Changchun 130024, Jilin, Peoples R China
Changchun Univ Since & Technol, Sch Sci, Dept Appl Math, Changchun 130022, Jilin, Peoples R China NE Normal Univ, Sch Math & Stat, Changchun 130024, Jilin, Peoples R China