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  1. Keitz, S. von; Keitz, W. von; Gerlach, H.: Modernes Online-Retrieval : der Weg zu den Wissensspeichern der Welt am Beispiel der DIALOG-Datenbanken (1993) 10.60 
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    Gerlach, H.
  2. Keitz, S. von; Keitz, W. von; Gerlach, H.: Grundfunktionen des Informationen Retrieval (1993) 10.60 
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    Gerlach, H.

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