Journal of Hebei University (Natural Science Edition) ›› 2008, Vol. 28 ›› Issue (1): 57-62,73.DOI: 10.3969/j.issn.1000-1565.2008.01.015
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LIU Hong-mei1,ZHAI Yong-qing1,ZHAO Jing2,SONG Wen-yu1,YANG Guo-zhong1,ZHANG Nan1