J. Glass, T. Hazen, D. Cyphers, K. Schutte, and A. Park. Proceedings of HLT/EMNLP on Interactive Demonstrations, page 28--29. Morristown, NJ, USA, Association for Computational Linguistics, (2005)
C. Munteanu, G. Penn, and R. Baecker. Proc. of 10th European Conference on Speech Communication and Technology - EuroSpeech / 8th INTERSPEECH, Antwerp, Belgium,, (August 2007)
A. Okada, and Y. Kambayashi. Advances in Web-Based Learning : First International Conference, ICWL 2002, Hong Kong, China, August 17-19, 2002. Proceedings, (2002)