user- Proceedings of the WWW2003 Conference, Budapest, Hungary, New York, ACM, (2003)
- Proc. of the 10th Int. Conf. on Principles of Knowledge Representation and Reasoning KR 2006, AAAI Press, (2006)
- Proceedings of the International Joint Conferences on Artificial Intelligence IJCAI-05, (2005)
- International Joint Conferences on Artificial Intelligence IJCAI-05, (2005)
- Proceedings of the OWL: Experiences and Directions Workshop, Galway, Ireland, (2005)
- 5th International Semantic Web Conference, Athens, GA, USA, November 5-9, LNCS 4273, Heidelberg, Springer Verlag, (2006)
