S. Dasiopoulou, I. Kompatsiaris, and M. Strintzis. Semantic Multimedia, Third International Conference on Semantic and Digital Media Technologies, SAMT 2008, Koblenz, Germany, page 31-46. (2008)
Z. Huang, F. van Harmelen, and A. ten Teije. Proceedings of the Nineteenth International Joint Conference on Artificial Intelligence (IJCAI'05), page xxx. Edinburgh, Scotland, (August 2005)
S. Konieczny, J. Lang, and P. Marquis. In Proceedings of the Nineteenth International Joint Conference on Artificial Intelligence (IJCAI’05, page 484--489. (2005)
T. Meyer, K. Lee, R. Booth, and J. Pan. AAAI'06: Proceedings of the 21st national conference on Artificial intelligence, page 269--274. AAAI Press, (2006)
C. Saathoff, M. Grzegorzek, and S. Staab. Semantic Multimedia, Third International Conference on Semantic and Digital Media Technologies, SAMT 2008, Koblenz, Germany, page 89-104. (2008)
T. Sang, P. Beame, and H. Kautz. IJCAI'07: Proceedings of the 20th international joint conference on Artifical intelligence, page 173--179. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2007)