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Document retrieval systems have been restricted, by the nature of tile task, to techniques that can be used with large numbers of documents and broad domains. The most effective techniques that have been developed are based on the statistics of word occurrences ill text. In this paper, we describe an approach to using natural language processiag (NLP) techniques for what is essentially a natural language problem -the comparison of a request text with the text of document titles and abstracts.doi:10.1145/42005.42009 dblp:conf/sigir/CroftL87 fatcat:yddpk576ljcmhbwbubk6n36cx4