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Tonta, Y.: Analysis of search failures in document retrieval systems : a review (1992)
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Pedretti, G.: ¬L'¬uso dei cataloghi in biblioteca (1996)
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Croft, W.B.: Effective retrieval based on combining evidence from the corpus and users (1995)
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Brown, M.E.: By any other name : accounting for failure in the naming of subject categories (1995)
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Why can't AI make it? (1993)
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