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Shandong Univ, Qilu Secur Inst Financial Studies, Jinan 250100, Peoples R China
Shandong Univ, Sch Math, Jinan 250100, Peoples R China
Chongqing Univ Arts & Sci, Dept Math, Chongqing, Peoples R China
Chongqing Univ Arts & Sci, KLDAIP, Chongqing, Peoples R China Shandong Univ, Qilu Secur Inst Financial Studies, Jinan 250100, Peoples R China