Journal of Hebei University (Natural Science Edition) ›› 2010, Vol. 30 ›› Issue (4): 400-407.DOI: 10.3969/j.issn.1000-1565.2010.04.014
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JING Ai-qin1,MA Zhai-pu2,ZHAO Jian-hua2,WU Ling2,SHI Chang-can2,ZHANG Chun-quan2