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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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Strzalkowski, T.: Natural language information retrieval (1995)
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Dalrymple, P.W.; Cox, R.: ¬An examination of the effects of non-Boolean enhancements to an information retrieval system (1992)
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