Ben Robins Kerstin Dautenhahn Rene te Boekhorst Chrystopher L. Nehaniv Behaviour delay and robot expressiveness in child-robot interactions: a user study on interaction kinesics. 17-24 2008 HRI http://doi.acm.org/10.1145/1349822.1349826 conf/hri/2008 db/conf/hri/hri2008.html#RobinsDBN08