Leelawong, K., Viswanath, K., Davis, J., Biswas, G., Vye, N., K., B., & Bransford, J. (2003). Teachable agents: Learning by teaching environments for science domains. Proceedings of the Fifteenth Annual Conference on Innovative Applications of Artificial Intelligence. Menlo Park, CA: AAAI Press. (Original work published 2003)