Journal of Hebei University (Natural Science Edition) ›› 2008, Vol. 28 ›› Issue (4): 369-372.DOI: 10.3969/j.issn.1000-1565.2008.04.009
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GUO Jian-xin1,LIU Bao-ting1,WEI Li-jing2,ZHANG Xin1,YAN Xiao-bing1,ZHAO Qing-xun1