P. Heim, S. Hellmann, J. Lehmann, S. Lohmann, and T. Stegemann. Proceedings of the 3rd International Conference on Semantic and Media Technologies (SAMT), volume 5887 of Lecture Notes in Computer Science, page 182-187. Springer, (2009)
J. Pérez, M. Arenas, and C. Gutierrez. International Semantic Web Conference, volume 5318 of Lecture Notes in Computer Science, page 66-81. Springer, (2008)