3Salton G, Wong A, Yang CS. On the specification of term values in automatic indexing[ J]. Journal of Documentation, 1973, 29 (4):351 - 372.
4姚天顺 朱靖波.自然语言理解[M](第2版)[M].北京:清华大学出版社,2002..
5Salton G, McGill M J. Introduction to Modem Information Retrieval.McGraw-Hill, 1983.
6Robertson S, Sparck-Jones K. Relevance Weighting of Search Terms.Journal of American Society for Information Science, 1976, 3(27):129-146.
7Deerwester S, Dumais S T, Furnas G W, et al. Indexing by Latent Semantic Analysis. Journal of the American Society for Information Science, 1990, 41(6): 391-407.
8Massot M, Rodriguez H, Ferres D. QA UdG-UPC System at TREC-12.In: Proceedings of the Twelfth Text Retrieval Conference, 2003:762.
9S Brin,L Page.The Anatomy of a Large-Scale Hypertexual Web Search Engine[A].Proc of the 7th WWW Conf[C].1998.
