Journal of Hebei University (Natural Science Edition) ›› 2002, Vol. 22 ›› Issue (1): 68-72.DOI: 10.3969/j.issn.1000-1565.2002.01.017
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URL: //xbzrb.hbu.edu.cn/EN/10.3969/j.issn.1000-1565.2002.01.017
//xbzrb.hbu.edu.cn/EN/Y2002/V22/I1/68
