1. Batliner A et al. (2003) How to find trouble in communication. Speech Commun 40(1–2):117–143
2. Batliner A et al. (2003) We are not amused—but how do you know? User states in a multi-modal dialogue system. In: Proc of INTERSPEECH, Geneva, Switzerland
3. Batliner A et al. (2006) Combining efforts for improving automatic classification of emotional user states. In: Proc of IS-LTC, Ljubljana, Slovenia
4. Batliner A et al. (2010) Segmenting into adequate units for automatic recognition of emotion-related episodes: a speech-based approach. Adv Hum Comput Interact. doi: 10.1155/2010/782802
5. Batliner A et al. (2011) Whodunnit—searching for the most important feature types signalling emotion-related user states in speech. Comput Speech Lang 25:4–28