- Journal of Experimental and Theoretical Artificial Intelligence (2002)
- Bull. Math. Soc. Sc. Math. de Roumanie 1(13):21-25 (1969)
- Begriffliche Wissensverarbeitung: Methoden und Anwendungen, page 25-56. Heidelberg, Springer, (2000)
- Bull. Math. Soc. Sc. Math. de Roumanie 1(13):21-25 (1969)
- Journal of Experimental & Theoretical Artificial Intelligence (2002)
- Actes des 16ièmes Journées Bases de Données Avancées, page 307-322. France, Blois, (October 2000)
- Proc. 7th Intl. Workshop on Knowledge Representation Meets Databases, (2000)http://ceur-ws.org/Vol-29. Part of stumme02computing .


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