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Vogt, F.; Wachter, C.; Wille, R.: Data analysis based on a conceptual file (1991)
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Kollewe, W.; Skorsky, M.; Vogt, F.; Wille, R.: TOSCANA - ein Werkzeug zur begrifflichen Analyse und Erkundung von Daten (1994)
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Vogt, F.; Wille, R.: TOSCANA - a graphical tool for analyzing and exploring data (1995)
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