Howard E. Shrobe Thomas G. Dietterich William R. Swartout Proceedings of the 8th National Conference on Artificial Intelligence. Boston, Massachusetts, July 29 - August 3, 1990, 2 Volumes. 0-262-51057-X AAAI Press / The MIT Press 1990 AAAI http://www.aaai.org/Conferences/AAAI/aaai90.php db/conf/aaai/aaai90.html