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- author's%3a%22Chang%2c S.-j.%22 2
- authors%3a%22Chang%2c S.-j.%22 2
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Vogt, F.; Wachter, C.; Wille, R.: Data analysis based on a conceptual file (1991)
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- S.131-142
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Scheich, P.; Skorsky, M.; Vogt, F.; Wachter, C.; Wille, R.: Conceptual data systems (1993)
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- S.72-84