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Vogt, F.; Wachter, C.; Wille, R.: Data analysis based on a conceptual file (1991)
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- Classification, data analysis, and knowledge organization. Ed.: H.H. Bock u. P. Ihm
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Wille, R.; Wachter, C.: Begriffsanalyse von Dokumenten (1992)
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- Information und Dokumentation in den 90er Jahren: neue Herausforderung, neue Technologien. Deutscher Dokumentartag 1991, Universität Ulm, 30.9.-2.10.1991. Hrsg.: W. Neubauer u. K.-H. Meier
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Scheich, P.; Skorsky, M.; Vogt, F.; Wachter, C.; Wille, R.: Conceptual data systems (1993)
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- Information and classification: concepts, methods and applications. Proceedings of the 16th Annual Conference of the Gesellschaft für Klassifikation, University of Dortmund, April 1-3, 1992. Ed.: O. Opitz u.a