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Liddy, E.D.; Diamond, T.; McKenna, M.: DR-LINK in TIPSTER (2000)
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Liddy, E.D.: Natural language processing for information retrieval and knowledge discovery (1998)
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Liddy, E.D.; Paik, W.; McKenna, M.; Yu, E.S.: ¬A natural language text retrieval system with relevance feedback (1995)
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