M. Krötzsch, S. Rudolph, and P. Hitzler. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 309--322. Berlin, Heidelberg, Springer Verlag, (November 2007)
P. Haase, and B. Motik. IHIS 05: Proceedings of the first international workshop on Interoperability of heterogeneous information systems, page 9-16. ACM Press, (November 2005)