Ginevra Castellano Kostas Karpouzis Jean-Claude Martin Louis-Philippe Morency Christopher Peters Laurel D. Riek 3rd international workshop on affective interaction in natural environments (AFFINE). 1759-1760 2010 ACM Multimedia http://doi.acm.org/10.1145/1873951.1874357 conf/mm/2010 db/conf/mm/mm2010.html#CastellanoKMMPR10