1. Fujita, M. and Kageyama, K, 1997, “An Open Architecture for Robot Entertainment”, In Proceedings of the 1st International Conference on Autonomous Agents, pp. 435–440.
2. Fujita, M., and Kitano, H., 1998, “Development of an Autonomous Quadruped Robot for Robot Entertainment”, Autonomous Robots, Vol. 5, pp. 7–18
3. Fujita, M, el al., 1998, “Reconfigurable Physical Agents”, In Proceedings of the 2nd International Conference on Autonomous Agents, pp. 54–61.
4. Hornby, G. et al, 1999, “Autonomous Evolution of Gaits with the Sony Quadruped Robot”, In Proceed-ings of Genetic and Evolutionary Computing Conference (GECCO), pp. 1297–1304.
5. Ekman, P. and Friesen, W. V., 1978, The facial action coding system, Consulting Psychologists Press.