Journal of Hebei University (Natural Science Edition) ›› 2006, Vol. 26 ›› Issue (1): 30-32,37.DOI: 10.3969/j.issn.1000-1565.2006.01.008
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SHAN Yao-jun1,ZHANG Jin-xia1,YUAN Hong-shui2,LI Xiao-yu1,HAN Ji-gang1,ZHU Bao-cheng3