S. Auer, and J. Lehmann. The Semantic Web: Research and Applications, 4th European Semantic Web Conference, ESWC 2007, Innsbruck, Austria, volume 4519 of Lecture Notes in Computer Science, Springer, Berlin, (2007)
M. Banko, M. Cafarella, S. Soderland, M. Broadhead, and O. Etzioni. Proceedings of the 20th International Joint Conference on Artifical Intelligence, page 2670--2676. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2007)
A. Ritter, Mausam, O. Etzioni, and S. Clark. Proceedings of the 18th ACM SIGKDD international conference on Knowledge discovery and data mining, page 1104--1112. New York, NY, USA, ACM, (2012)
S. Auer, and J. Lehmann. ESWC '07: Proceedings of the 4th European conference on The Semantic Web, page 503--517. Berlin, Heidelberg, Springer-Verlag, (2007)