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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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Stock, W.G.: Qualitätskriterien von Suchmaschinen : Checkliste für Retrievalsysteme (2000)
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- Password. 2000, H.5, S.22-31