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机构:
Henan Normal Univ, Dept Math & Informat Sci, Xinxiang 453007, Henan, Peoples R China
Univ Poitiers, Lab Math & Applicat, UMR CNRS 7348 SP2MI, Blvd Marie & Pierre Curie Teleport 2, F-86962 Futuroscope, France North China Univ Water Resources & Elect Power, Coll Math & Stat, Zhengzhou 450011, Peoples R China