ＺＨＡＮＧＴｉｎｇ ＬＩＨｏｎｇｇａｎｇ. J. Journal of Beijing Normal University(Natural Science), 2013, 49(5): 538-541.
Citation: ＺＨＡＮＧＴｉｎｇ ＬＩＨｏｎｇｇａｎｇ. J. Journal of Beijing Normal University(Natural Science), 2013, 49(5): 538-541.
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