1. Baker, R.S.: Modeling and understanding students off-task behavior in intelligent tutoring systems. In: Proceedings of SIGCHI Conference Human Factors, Computing Systems, pp. 1059–1068 (2007)
2. Beck, J.: Engagement tracing: using response times to model student disengagement. In: Proceedings of 12th International Conference Artificial Intelligence in Education (AIED 2005), pp. 88–95 (2005)
3. Cetintas, S., Si, L., Xin, Y.P., Hord, C.: Automatic detection of off-task behaviors in intelligent tutoring systems with machine learning techniques. IEEE Trans. Learn. Technol. 3(3), 228–236 (2010)
4. Dzikovska, M.O., et al.: SemEval-2013 task 7: the joint student response analysis and 8th recognizing textual entailment challenge. In: The First Joint Conference on Lexical and Computational Semantics, SEM 2013, Atlanta, Georgia, USA, 13–14 June. Association for Computational Linguistics (2013)
5. Graesser, A.C., Lu, S., Jackson, G.T., Mitchell, H.H., Ventura, M., Olney, A., Louwerse, M.M.: AutoTutor: a tutor with dialogue in natural language. Behav. Res. Methods Instrum. Comput. 36(2), 180–192 (2004)