北方交通大学计算机与信息技术学院,北京师范大学数学系,北京师范大学数学系 北京 100044
,北京 100875
,北京 100875
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折叠
Ji Qiang LIU(College of Computer and Information Technology, Northern Jiaotong University, Beijing 100044, P. R. China)Dong Sheng LIAO Li Bo LUO(Department of Mathematics, Beijing Normal University, Beijing 100875, P. R. China) (Fax: (010)51686252; E-mail: jqliu2Q02cn@yahoo.com.cn)
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