1. Abou-Jaoude, S., Frasson, C., Charra, O., Troncy, R.: On the Application of a Believable Layer in ITS. In: Workshop on Synthetic Agents, 9th International Conference on Artificial Intelligence in Education, Le Mans (1999)
2. Ahsen, A.: Guided imagery: the quest for a science. Part I: Imagery origins. Education 110, 2–16 (1997)
3. Bach, J.S.: Brandenburg Concerto No.2. In: Music from Ravinia series, New York, RCA Victor Gold Seal (1721) 60378-2-RG
4. Conati, C.: Probabilistic Assessment of User’s Emotions in Educational Games. Journal of Applied Artificial Intelligence 16, 555–575 (2002)
5. Damasio, A.: Descartes Error. Emotion, Reason and the Human Brain. Putnam Press, New York (1994)