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Wätjen, H.-J.: Mensch oder Maschine? : Auswahl und Erschließung vonm Informationsressourcen im Internet (1996)
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Wätjen, H.-J.: Hypertextbasierte OPACs im World-wide Web (1996)
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Wätjen, H.-J.: GERHARD : Automatisches Sammeln, Klassifizieren und Indexieren von wissenschaftlich relevanten Informationsressourcen im deutschen World Wide Web (1998)
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Wätjen, H.-J.: Automatisches Sammeln, Klassifizieren und Indexieren von wissenschaftlich relevanten Informationsressourcen im deutschen World Wide Web : das DFG-Projekt GERHARD (1998)
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Wätjen, H.-J.: Zur Realität virtueller Bibliotheken : Möglichkeiten, Aufgaben, Probleme (1999)
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Rospert, H.; Schmuck, H.: Online-Benutzerkatalog bietet schnellen Zugriff (1995)
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Entwicklungsprojekt "Online-Benutzerkatalog" : ein Zwischenbericht (1989)
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Schnelling, H.M.: Katalogverbund, Fremddatennutzung und Online-Benutzerkatalog : Aspekte einer Neuorientierung der Sacherschließung (1988)
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Honeit, W.: ¬Der Online-Benutzerkatalog im lokalen Bibliothekssystem der Deutschen Bücherei Leipzig (1995)
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Gattermann, G.: Kann der Online-Benutzerkatalog unser Katalogproblem lösen? : Erfahrungen aus dem OPAC-Projekt der Universitätsbibliothek Düsseldorf (1990)
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