P. Heim, S. Lohmann, D. Tsendragchaa, and T. Ertl. Proceedings of the 7th International Conference on Semantic Systems (I-SEMANTICS 2011), page 175-178. New York, NY, USA, ACM, (2011)
P. Heim, T. Ertl, and J. Ziegler. Proceedings of the 7th Extended Semantic Web Conference (ESWC 2010), volume 6088 of LNCS, page 288-302. Berlin/Heidelberg, Springer, (2010)