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Jackson, G. T., Olney, A., Graesser, A. C., & Kim, H. J. (2006). AutoTutor 3-D Simulations: Analyzing user’s actions and learning trends. In R. Son (Ed.), Proceedings of the 28th Annual Meetings of the Cognitive Science Society. (pp. 1557-1562). Mahwah, NJ: Erlbaum.