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机构:
Nanjing Normal Univ, Sch Math Sci, Nanjing 210097, Jiangsu, Peoples R China
Nanjing Univ, Ctr Nonlinear Sci, Nanjing 210093, Jiangsu, Peoples R China East China Univ Sci & Technol, Dept Math, Shanghai 200237, Peoples R China