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)
D. Sonntag, and M. Möller. Proceedings of IUI '10: 15th International Conference on Intelligent User Interfaces, Hong Kong, China, page 381-384. (2010)
P. Cimiano, P. Haase, and J. Heizmann. Proceedings of IUI '07: 12th International Conference on Intelligent User Interfaces, Honolulu, HI, USA, page 180-189. (2007)