Journal of Hebei University (Natural Science Edition) ›› 2001, Vol. 21 ›› Issue (2): 176-178.DOI: 10.3969/j.issn.1000-1565.2001.02.017
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URL: //xbzrb.hbu.edu.cn/EN/10.3969/j.issn.1000-1565.2001.02.017
//xbzrb.hbu.edu.cn/EN/Y2001/V21/I2/176
