Library Research ›› 2008, Vol. 38 ›› Issue (3): 104-105.
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WANG Jian-Ping, SUN Wen-xin (1.School of Information Engineer, Renan Institute of Science and Technology,Xinxiang 453003,China; 2.School of Electrical Engineer, Hebi College of Vocation and Technology,Hebi 458000,China)