Julia Vogel Bernt Schiele A Semantic Typicality Measure for Natural Scene Categorization. 195-203 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3175&spage=195 2004 conf/dagm/2004 DAGM-Symposium db/conf/dagm/dagm2004.html#VogelS04