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  1. Dreis, G.: Zur Retrievalorganisation des OPAC (1991) 10.09 
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  2. Dreis, G.: Zur Analyse des Benutzerverhaltens. T.2 (1991) 10.09 
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  3. Dreis, G.: Formen des sachlichen Zugriffs : Probleme des automatischen Indexierens (1991) 10.09 
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  4. Dreis, G.: Benutzerverhalten an einem Online-Publikumskatalog für wissenschaftliche Bibliotheken : Ergebnisse und Erfahrungen aus dem OPAC-Projekt der Universitätsbibliothek Düsseldorf (1994) 10.09 
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