U. Schäfer, F. Arnold, S. Ostermann, und S. Reifers. KI 2013: Advances in Artificial Intelligence, 36th Annual German Conference on AI, Koblenz, Germany, Volume 8077 von Lecture Notes in Artificial Intelligence, Springer, Heidelberg, (2013)
U. Callmeier, A. Eisele, U. Schäfer, und M. Siegel. Proceedings of the 4th International Conference on Language Resources and Evaluation (LREC 2004), Lisbon, Portugal, Seite 1205-1208. European Language Resources Association (ELRA), (2004)