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Vogt, F.; Wachter, C.; Wille, R.: Data analysis based on a conceptual file (1991) 0.03

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Source: Classification, data analysis, and knowledge organization. Ed.: H.H. Bock u. P. Ihm

Scheich, P.; Skorsky, M.; Vogt, F.; Wachter, C.; Wille, R.: Conceptual data systems (1993) 0.02

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