Nicos Angelopoulos clp(pdf(y)): Constraints for Probabilistic Reasoning in Logic Programming. 784-788 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2833&spage=784 2003 conf/cp/2003 CP db/conf/cp/cp2003.html#Angelopoulos03