Daniel B. Russakoff Carlo Tomasi Torsten Rohlfing Calvin R. Maurer Jr. Image Similarity Using Mutual Information of Regions. 596-607 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3023&spage=596 2004 conf/eccv/2004-3 ECCV (3) db/conf/eccv/eccv2004-3.html#RussakoffTRM04