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Li, N., Tian, Y., Cohen, W., & Koedinger, K.R. (2013). Integrating perceptual learning with external world knowledge in a simulated student. InH.C. Lane, K. Yacef, J. Mostow, & P. Pavlik (Eds.), Proceedings of the 16th International Conference on Artificial Intelligence in Education, pp. 400-410.