Jude W. Shavlik Gerald DeJong BAGGER: An EBL System that Extends and Generalizes Explanations. 516-520 1987 conf/aaai/1987 AAAI db/conf/aaai/aaai87.html#ShavlikD87 http://www.aaai.org/Library/AAAI/1987/aaai87-092.php