ＣＡＩ Ｊｕｎｌｉａｎｇ. J. Journal of Beijing Normal University(Natural Science), 2013, 50(6): 557-559.
Citation: ＣＡＩ Ｊｕｎｌｉａｎｇ. J. Journal of Beijing Normal University(Natural Science), 2013, 50(6): 557-559.
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