1. Baader, F., et al. (eds.): Description Logic Handbook. Cambridge University Press, Cambridge (2002)
2. Brachman, R.: What isa is and isn’t: an analysis of taxonomic links in semantic networks. IEEE Computer 16(10) (1983)
3. Brachman, R., et al.: Living with CLASSIC: When and how to use a KL-ONE-like language. In: Sowa, J. (ed.) Principles of Semantic Networks, Morgan Kaufmann, San Francisco (1991)
4. Cranefield, S., Purvis, M.: UML as an ontology modeling language. In: Proc. IJCAI 1999 (1999)
5. Lecture Notes in Computer Science;N. Guarino,2000