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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 龐劍鋒,蔔東波,白碩,基於曏量空間模型的文本自動分類系統的研究與實現,計算機應用研究,2001年第9期第18卷