1. McTear, M.: Spoken Dialogue Technology: Enabling the Conversational User Interface. In: ACM Computing Surveys, pp. 1–85 (2002)
2. Neto, J., Mamede, N., Cassaca, R., Oliveira, L.: The Development of a Multi-purpose Spoken Dialogue System. In: EUROSPEECH 2003 - 8th European Conference on Speech Communication and Technology (2003)
3. Allen, J., Ferguson, G., Stent, A.: An architecture for more realistic conversational systems. In: Proc. of Intelligent User Interfaces (IUI 2001), Santa Fe, NM, January 14-17 (2001)
4. Madeira, P., Mourão, M., Mamede, N.: STAR FRAMES - A step ahead in the design of conversational systems capable of handling multiple domains, ICEIS. Angers, France (2003)
5. Traum, D.R.: Speech Acts for Dialogue Agents. In: UMIACS, Univ. of Maryland, pp. 17–30 (1999)