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Lanzhou Univ, Sch Math & Stat, Key Lab Appl Math & Complex Syst, Lanzhou 730000, Gansu, Peoples R China
Northwest A&F Univ, Coll Sci, Yangling 712100, Shaanxi, Peoples R China Lanzhou Univ, Sch Math & Stat, Lanzhou 730000, Gansu, Peoples R China