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机构:
Henan Normal Univ, Coll Math & Informat Sci, Xinxiang 453007, Henan, Peoples R China
Beijing Inst Technol, Sch Mechatron Engn, Beijing 100081, Peoples R China
Civil Aviat Univ China, Dept Math, Tianjin 300300, Peoples R China Henan Normal Univ, Coll Math & Informat Sci, Xinxiang 453007, Henan, Peoples R China