Visualizing minimal ingroup and outgroup faces: implications for impressions, attitudes, and behavior
Journal of Personality and Social Psychology (2014) - Comment
pubmed: 24841095  doi: 10.1037/a0036498  issn: 1939-1315  issn: 0022-3514 

Kyle G. Ratner, Ron Dotsch, Daniel H. J. Wigboldus, Ad Van Knippenberg, David M. Amodio