1. Biswas, G., Leelawong, K., Schwartz, D., Vye, N., Vanderbilt, T.: Learning by teaching: A new agent paradigm for educational software. Applied Artificial Intelligence 19(3), 363–392 (2005)
2. Schwartz, D., Blair, K., Biswas, G., Leelawong, K., Davis, J.: Animations of thought: Interactivity in the teachable agent paradigm. In: Lowe, R., Schnotz, W. (eds.) Learning with Animation: Research and Implications for Design, pp. 114–140. Cambridge University Press, UK (2007)