David Sontag Talya Meltzer Amir Globerson Tommi Jaakkola Yair Weiss Tightening LP Relaxations for MAP using Message Passing. 503-510 2008 UAI http://uai.sis.pitt.edu/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=1322&proceeding_id=24 conf/uai/2008 db/conf/uai/uai2008.html#SontagMGJW08