1. Lee, C.M., Narayanan, S.: Towards detecting emotions in spoken dialogs. IEEE Transactions on Speech and Audio Processing 13, 293–303 (2005)
2. Ang, J., Dhillon, R., Krupski, A., Shriberg, E., Stolcke, A.: Prosody-based automatic detection of annoyance and frustration in human-computer dialog. In: Proceedings of ICSLP, Denver, Colorado, USA, pp. 2037–2039 (2002)
3. Litman, D., Forbes-Riley, K.: Predicting student emotions in computer-human tutoring dialogues. In: Proceedings of the 42nd Annual Meeting of the Association for Compuational Linguistics (ACL), Barcelona, Spain (2004)
4. Gorin, A.L., Riccardi, G., Wright, J.H.: How may I help you? Speech Communication 23, 113–127 (1997)
5. Gupta, N., Tur, G., Hakkani-Tür, D., Bangalore, S., Riccardi, G., Rahim, M.: The AT&T spoken language understanding system. IEEE Transactions on Speech and Audio Processing (to appear)