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 IUI '10: 15th International Conference on Intelligent User Interfaces, Hong Kong, China, page 381-384. (2010)
M. Johnston, S. Bangalore, A. Stent, G. Vasireddy, and P. Ehlen. Proceedings of ICSLP---Interspeech 2002: 7th International Conference on Spoken Language Processing, Denver, CO, USA, page 2237-2240. (2002)
P. Ehlen, M. Johnston, and G. Vasireddy. Proceedings of ICSLP---Interspeech 2002: 7th International Conference on Spoken Language Processing, Denver, CO, USA, page 2557-2560. (2002)
R. Catizone, A. Setzer, and Y. Wilks. Proceedings of the EACL 2003 Workshop on Dialogue Systems: Interaction, Adaptation, and Styles of Management, Budapest, Hungary, (2003)