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Deerwester et al.Indexing by Latent semantic analysis[J].Journal of the American society for information science,1990,41 (6) 391-407 庞剑锋,卜东波,白硕,基于向量空间模型的文本自动分类系统的研究与实现,计算机应用研究,2001年第9期第18卷