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Wätjen, H.-J.: ORBIS, der Oldenburger Online-Benutzerkatalog (1991)
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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.: 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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Foest, G.; Lange, G.: Network information services : new tools offer new changes (1993)
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Hildreth, C.R.: Are Web-based OPACs more effective retrieval systems than their conventional predecessors? : an experimental study (2000)
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Long, C.E.: Improving subject searching in Web-based OPACs : evaluation of the problem and guidelines for design (2000)
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Butterfield, K.: Online Public Access Catalogs (OPACs) (2009)
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Hillmann, D.I.: "Parallel universes" or meaningful relationships : envisioning a future for the OPAC and the net (1996)
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