Burgun, A., Bodenreider, O.: Mapping the UMLS Semantic Network into General Ontologies, Proceedings of American Medical Informatics Association (AMIA) Annual Symposium 2001, 86-90, 2001.
Gómez-Pérez, A., Fernándes-López, M., and Corcho, O.: Ontological Engineering, Springer, London, 2004.