Tibério S. Caetano Terry Caelli Dante Augusto Couto Barone An Optimal Probabilistic Graphical Model for Point Set Matching. 162-170 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3138&spage=162 2004 conf/sspr/2004 SSPR/SPR db/conf/sspr/sspr2004.html#CaetanoCB04