B. Liu, H. Chen, and W. He. ICTAI '05: Proceedings of the 17th IEEE International Conference on Tools with Artificial Intelligence, Hong Kong, China, page 254-259. (2005)
B. Grosof, I. Horrocks, R. Volz, and S. Decker. WWW '03: Proceedings of the 12th International World Wide Web Conference, Budapest, Hungary, page 48-57. (2003)