J.  Movellan, Eckhardt, M., Virnes, M., and Rodriguez, A., ?Sociable robot improves toddler vocabulary skills?, in 2009 4th ACM/IEEE International Conference on Human-Robot Interaction (HRI), La Jolla, CA, 2009.

F.  Tanaka, Cicourel, A., and Movellan, J., ?Socialization between toddlers and robots at an early childhood education center?, Proceedings of the National Academy of Science, vol. 104, no. 46, 2007.