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Nanjing Univ, Sch Business, Nanjing 210008, Jiangsu, Peoples R China
Nanjing Univ, Dept Math, Nanjing 210008, Jiangsu, Peoples R China Nanjing Univ, Sch Management & Engn, Int Ctr Management Sci & Engn, Nanjing 210008, Jiangsu, Peoples R China