S. Hellmann, C. Stadler, J. Lehmann, and S. Auer. Proc. of 8th International Conference on Ontologies, DataBases, and Applications of Semantics (ODBASE), (2009)
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)