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Feldman, S.: Testing natural language : comparing DIALOG, TARGET, and DR-LINK (1996)
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Evans, R.: Beyond Boolean : relevance ranking, natural language and the new search paradigm (1994)
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Strzalkowski, T.: Natural language information retrieval (1995)
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Pritchard-Schoch, T.: Comparing natural language retrieval : Win & Freestyle (1995)
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Hersh, W.R.; Hickam, D.H.: ¬An evaluation of interactive Boolean and natural language searching with an online medical textbook (1995)
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