1. Lenat, B.D.: Cyc: A large-scale investment in knowledge infrastructure. Communication of the ACM 38(11), 33–38 (1995)
2. Philipot, A., Hovy, E.H., Pantel, P.: The omega ontology. In: Proceedings of the ONTOLEX Workshop at the International Conference on Natural Language Processing, pp. 59–66 (2005)
3. Kalfoglou, Y., Schorlemmer, M.: Ontology mapping: the state of the art. Knowledge Engineering Review 18(1), 1–31 (2003)
4. Tsovaltzi, D., Fiedler, A.: Enhancement and use of a mathematical ontology in a tutorial dialog system. In: Proceedings of the IJCAI Workshop on Knowledge Representation and Automated Reasoning for E-Learning Systems, Acapulco (Mexico), pp. 23–35 (2003)
5. Dzikovska, M.O., Allen, J.F., Swift, D.M.: Integrating linguistic and domain knowledge for spoken dialogue systems in multiple domains. In: Proceedings of the IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems, Acapulco (Mexico), pp. 25–35 (2003)