U. Lösch, S. Rudolph, D. Vrandecić, and R. Studer. 6th European Semantic Web Conference (ESWC 09), volume 5554 of Lecture Notes on Computer Science, page 278--292. Springer-Verlag, (June 2009)
M. Klein, D. Fensel, A. Kiryakov, and D. Ognyanov. Proceedings of the 13th European Conference on Knowledge Engineering and Knowledge Management (EKAW'02), page 197--212. Siguenza, Spain, (2002)
V. Papavassiliou, G. Flouris, I. Fundulaki, D. Kotzinos, and V. Christophides. Proceedings of the 8th International Semantic Web Conference (ISWC 2009), volume 5823 of Lecture Notes in Computer Science, page 473-488. Washington, DC, USA, Springer Verlag, (October 2009)