Journal of Hebei University (Natural Science Edition) ›› 2004, Vol. 24 ›› Issue (4): 430-433.DOI: 10.3969/j.issn.1000-1565.2004.04.021
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URL: //xbzrb.hbu.edu.cn/EN/10.3969/j.issn.1000-1565.2004.04.021
//xbzrb.hbu.edu.cn/EN/Y2004/V24/I4/430
