Journal of Hebei University (Natural Science Edition) ›› 2003, Vol. 23 ›› Issue (1): 81-84.DOI: 10.3969/j.issn.1000-1565.2003.01.022
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URL: //xbzrb.hbu.edu.cn/EN/10.3969/j.issn.1000-1565.2003.01.022
//xbzrb.hbu.edu.cn/EN/Y2003/V23/I1/81
