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Lanzhou Univ Finance & Econ, Longqiao Coll, Dept Math, Lanzhou 730101, Peoples R China
Univ Elect Sci & Technol China, Dept Appl Math, Chengdu 610054, Peoples R China Lanzhou Univ Finance & Econ, Longqiao Coll, Dept Math, Lanzhou 730101, Peoples R China