Journal of Hebei University (Natural Science Edition) ›› 2007, Vol. 27 ›› Issue (3): 253-256.DOI: 10.3969/j.issn.1000-1565.2007.03.009
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ZHAO Shu-min1,ZHANG Yin-jie1,GUO Tao2,LI Xia1,CAO Xiao-bing3,WANG Fang3,ZHAO Wei4,PANG Xue-xia1