Sergey Kirshner Padhraic Smyth Andrew Robertson Conditional Chow-Liu Tree Structures for Modeling Discrete-Valued Vector Time Series. 317-314 2004 conf/uai/2004 UAI http://uai.sis.pitt.edu/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=1125&proceeding_id=20 db/conf/uai/uai2004.html#KirshnerSR04