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Gebhardt, F.: Dokumentationssysteme (1981)
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Lancaster, F.W.: Vocabulary control for information retrieval (1986)
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Henzler, R.G.: Information und Dokumentation : Sammeln, Speichern und Wiedergewinnen von Fachinformation in Datenbanken (1992)
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Rijsbergen, C.J. van: Information retrieval (1979)
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