- Ahmed Hebni Helal, Joachim W. Weiss:
Opportunity 2000: Understanding and Serving Users in an Electronic Library. 15th International Essen Symposium, 12-15 October 1992, Festschrift in honor of Herbert S. White. Veröffentlichungen der Universitäsbibliothek Essen 15, Universitäsbibliothek Essen 1993, ISBN 3-922602-17-7 [contents]
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