S. Auer, C. Bizer, G. Kobilarov, J. Lehmann, R. Cyganiak, and Z. Ives. The Semantic Web, 6th International Semantic Web Conference, 2nd Asian
Semantic Web Conference, ISWC 2007 + ASWC 2007, Busan, Korea,
November 11-15, 2007, volume 4825 of Lecture Notes in Computer Science, page 722--735. Springer, (2007)