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Nankai Univ, Sch Math Sci, Tianjin 300071, Peoples R China
Nankai Univ, TEDA Inst Computat Finance, Tianjin 300071, Peoples R China
Nankai Univ, Sch Business, Tianjin 300071, Peoples R China Nankai Univ, Sch Math Sci, Tianjin 300071, Peoples R China