R. Witte, and T. Gitzinger. 13th International Conference on Applications of Natural Language to Information Systems (NLDB 2008), volume 5039 of LNCS, page 317--322. London, UK, Springer, (June 2008)
R. Witte, Y. Zhang, and J. Rilling. 4th European Semantic Web Conference (ESWC 2007), 4519, page 37--52. Innsbruck, Austria, Springer-Verlag Berlin Heidelberg, (June 2007)