Hasegawa, D., R. Rzepka, and K. Araki. “A Method for Acquiring Body Movement Verbs for a Humanoid Robot through Physical Interaction With Humans”. Proceedings of the AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment, vol. 5, no. 1, Oct. 2009, pp. 34-39, doi:10.1609/aiide.v5i1.12355.