Y. Cui, and C. Penstein Rosé. Intelligent Tutoring Systems, volume 5091 of Lecture Notes in Computer Science, chapter 107, Springer-Verlag, Berlin/Heidelberg, (2008)
S. Gandhe, N. Whitman, D. Traum, and R. Artstein. Proceedings of the 6th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems, Association for the Advancement of Artificial Intelligence (AAAI), (2009)
R. Nesselrath, and D. Porta. Proceedings of the 7th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems (KRPDS-11), page 37-47. (July 2011)
R. Neßelrath. Proceedings of the 9th International Conference on Intelligent Environments (IE). International Conference on Intelligent Environments (IE-13), July 18-19, Athen, Greece, page 266-269. Washington, DC, USA, IEEE Computer Society, (2013)