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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
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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