Iain McCowan Daniel Gatica-Perez Samy Bengio Darren Moore Hervé Bourlard Towards Computer Understanding of Human Interactions. 235-251 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2875&spage=235 2003 conf/eusai/2003 EUSAI db/conf/eusai/eusai2003.html#McCowanGBMB03