1. Russell, J.A.: A circumplex model of affect. Journal of Personality and Social Psychology 39, 1161–1178 (1980)
2. Cornelius, R.R.: The science of emotion: Research and tradition in the psychology of emotions. Prentice-Hall, Englewood Cliffs (1996)
3. Syrdal, A.K., Conkie, A., Kim, Y.J., Beutnagel, M.: Speech acts and dialog TTS. In: Proceedings of the 7th ISCA Speech Synthesis Workshop – SSW7, Kyoto, Japan, pp. 179–183 (2010)
4. Zovato, E., Pacchiotti, A., Quazza, S., Sandri, S.: Towards emotional speech synthesis: A rule based approach. In: Proceedings of the 5th ISCA Speech Synthesis Workshop – SSW5, Pittsburgh, PA, USA, pp. 219–220 (2004)
5. Hamza, W., Bakis, R., Eide, E.M., Picheny, M.A., Pitrelli, J.F.: The IBM expressive speech synthesis system. In: Proceedings of the 8th International Conference on Spoken Language Processing – ISCLP, Jeju, Korea, pp. 2577–2580 (2004)