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Olney, A., D’Mello, S., Person, N., Cade, W., Hays, P., Williams, C., Lehman, B., & Graesser, A. (2012). Guru: A Computer Tutor that Models Expert Human Tutors. Proceedings of the 11th International Conference on Intelligent Tutoring Systems, (pp. 256-261). Berlin: Springer.