Journal of East China Normal University(Natural Sc ›› 2006, Vol. 2006 ›› Issue (4): 123-126,.
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YI Zheng-fang1,2, LI Yong-qing2, YUAN Wu-zhou2, WANG Yue-qun2, ZHU Chuan-bing2, LIU Fang2, WU Zi-rong1, WU Xiu-shan2