Journal of Hebei University (Natural Science Edition) ›› 2007, Vol. 27 ›› Issue (6): 659-662,668.DOI: 10.3969/j.issn.1000-1565.2007.06.023
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WANG Ting-tai,ZHANG Yu-guang,ZHANG Jing-chang,LIU Sheng-man,YANG Lin-feng,ZHNAG Ming,YANG De-hong,GAO Xia