Patrik O. Hoyer Antti Hyttinen Bayesian Discovery of Linear Acyclic Causal Models. 240-248 2009 UAI http://uai.sis.pitt.edu/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=1611&proceeding_id=25 conf/uai/2009 db/conf/uai/uai2009.html#HoyerH09