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Bates, M.J.: Where should the person stop and the information search interface start? (1990)
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- Information processing and management. 26(1990), S.575-591
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Gomez, L.; Lochbaum, C.C.; Landauer, T.K.: All the right words: finding what you want as an function of richness of indexing vocabulary (1990)
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- Journal of the American Society for information Science. 41(1990) no.8, S.547-559
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Frakes, W.B.: Introduction to information storage and retrieval systems (1992)
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- Information retrieval: data structures and algorithms. Ed.: W.B. Frakes u. R. Baeza-Yates