Changhe Yuan Brandon M. Malone An Improved Admissible Heuristic for Learning Optimal Bayesian Networks. 924-933 2012 UAI https://dslpitt.org/uai/displayArticleDetails.jsp?mmnu=1&smnu=2&article_id=2358&proceeding_id=28 conf/uai/2012 db/conf/uai/uai2012.html#YuanM12