Paul R. Cohen Glenn Shafer Prakash P. Shenoy Modifiable Combining Functions. 357-374 1987 conf/uai/1987 UAI http://uai.sis.pitt.edu/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=1827&proceeding_id=1003 db/conf/uai/uai1987.html#CohenSS87