Barbara Hayes-Roth Richard E. Korf Proceedings of the 12th National Conference on Artificial Intelligence, Seattle, WA, USA, July 31 - August 4, 1994, Volume 1. 0-262-61102-3 AAAI Press / The MIT Press 1994 AAAI http://www.aaai.org/Conferences/AAAI/aaai94.php db/conf/aaai/aaai94-1.html