Peter H. Kahn Jr. Aimee L. Reichert Heather E. Gary Takayuki Kanda Hiroshi Ishiguro Solace Shen Jolina H. Ruckert Brian T. Gill The new ontological category hypothesis in human-robot interaction. 159-160 2011 HRI http://doi.acm.org/10.1145/1957656.1957710 conf/hri/2011 db/conf/hri/hri2011.html#KahnRGKISRG11