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Olney, A. M., Graesser, A. C., & Person, N. K. (2010). Tutorial Dialog in Natural Language. In R. Nkambou, J. Bourdeau, & R. Mizoguchi (Eds.), Advances in Intelligent Tutoring Systems, Studies in Computational Intelligence (Vol. 308, pp. 181-206). Berlin: Springer-Verlag.