Journal of Hebei University (Natural Science Edition) ›› 2006, Vol. 26 ›› Issue (1): 101-103.DOI: 10.3969/j.issn.1000-1565.2006.01.024
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WANG Qian1,ZHANG Jun-gang2,WANG Shi-kui3,ZHAO Qing-zhen4,LIU Hui-xin1,LIU Yu-xia1,YANG Li-hua1