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Wätjen, H.-J.: ORBIS, der Oldenburger Online-Benutzerkatalog (1991)
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Becker, H.J.; Diedrichs, R.; Eversberg, B.; Rath-Beckmann, A.; Wätjen, H.-J.; Zick, W.; Zillmann, H.: ¬Das PICA-System (1992)
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Wätjen, H.-J.: Hypertextbasierte OPACs im World-wide Web (1996)
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Koch, T.; Seiffert, F.; Wätjen, H.-J.: Informationen im Web anbieten und wiederfinden (1998)
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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.: Zur Realität virtueller Bibliotheken : Möglichkeiten, Aufgaben, Probleme (1999)
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Diekmann, B.; Wätjen, H.-J.: Copacabana : Computer Aided Publishing, Administrating, Cataloguing, Bibliographic and Networked Access (2000)
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