Andres Madsen A Differential Semantics of Lazy AR Propagation. 364-371 2005 conf/uai/2005 UAI http://uai.sis.pitt.edu/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=1188&proceeding_id=21 db/conf/uai/uai2005.html#Madsen05