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China Univ Min & Technol, Sch Math, Xuzhou 221116, Jiangsu, Peoples R China
Xuzhou Univ Technol, Sch Math & Phys, Xuzhou 221008, Jiangsu, Peoples R China China Univ Min & Technol, Sch Math, Xuzhou 221116, Jiangsu, Peoples R China