Zhihong Cai Manabu Kuroki Counterfactual Reasoning in Linear Structural Equation Models. 77-84 2005 conf/uai/2005 UAI http://uai.sis.pitt.edu/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=1198&proceeding_id=21 db/conf/uai/uai2005.html#CaiK05