Journal of Hebei University (Natural Science Edition) ›› 2005, Vol. 25 ›› Issue (5): 523-525.DOI: 10.3969/j.issn.1000-1565.2005.05.017
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WANG Qian1,LIU Hui-xin1,ZHANG Jun-gang2,LU Jie1,LIU Yu-xia1,YANG Li-hua1,JI Hong3,CHEN Wen-jie3