Ryszard Kowalczyk Efficient Algorithm for Estimation of Qualitative Expected Utility in Possibilistic Case-based Reasoning. 69-76 2005 conf/uai/2005 UAI http://uai.sis.pitt.edu/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=1226&proceeding_id=21 db/conf/uai/uai2005.html#Kowalczyk05