P. Cimiano, P. Haase, and J. Heizmann. Proceedings of IUI '07: 12th International Conference on Intelligent User Interfaces, Honolulu, HI, USA, page 180-189. (2007)
U. Callmeier, A. Eisele, U. Schäfer, and M. Siegel. Proceedings of the 4th International Conference on Language Resources and Evaluation (LREC 2004), Lisbon, Portugal, page 1205-1208. European Language Resources Association (ELRA), (2004)