1. Baader, F., et al.: The description Logic Handbook - Theory, Implementation and Applications. Cambridge University Press, Cambridge (2003)
2. Lecture Notes in Computer Science;B. Bauer,2001
3. Berardi, D.: Using DLs to reason on UML class diagrams. In: Proceedings of th KI- 2002 Workshop on Applications of Description Logics (2002)
4. Biddle, J., Thomas, E.: Role Theory: Concepts and Research. John Wiley and Sons, New York (1966)
5. Borst, W.N.: Construction of Engineering Ontologies. University of Twente, Enschede, NL, Center for Telematica and Information Technology (1997)