S. Auer, C. Bizer, G. Kobilarov, J. Lehmann, R. Cyganiak, and Z. Ives. Proceedings of the 6th International Semantic Web Conference (ISWC), volume 4825 of Lecture Notes in Computer Science, page 722--735. Springer, (2008)
S. Hellmann, J. Lehmann, and S. Auer. Proceedings of the Poster and Demonstration Session at
the 7th International Semantic Web Conference
(ISWC2008), Karlsruhe, Germany, October 28, 2008, volume 401 of CEUR Workshop Proceedings, CEUR-WS.org, (2008)