R. op den Akker, H. Bunt, S. Keizer, and B. van Schooten. Proceedings of Interspeech 2005---Eurospeech: 9th European Conference on Speech Communication and Technology. Lisbon, Portugal, page 2793--2796. (2005)
D. Sonntag, and M. Möller. Proceedings of the International Conference on Knowledge Management and Information Sharing (KMIS), Madeira, Portugal, (2009)
S. Rosset, O. Galibert, G. Illouz, and A. Max. Proceedings of Interspeech 2006---ICSLP: 9th International Conference on Spoken Language Processing, Pittsburgh, PA, USA, page 1914-1917. (2006)
H. Pon-Barry, F. Weng, and S. Varges. Proceedings of Interspeech 2006---ICSLP: 9th International Conference on Spoken Language Processing, Pittsburgh, PA, USA, page 1930-1933. (2006)
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)