Philip Johnson Wendy G. Lehnert Beyond Exploratory Programming: A Methodology and Environment for Conceptual Natural Language Processing. 594-600 1986 conf/aaai/1986-1 AAAI db/conf/aaai/aaai86-1.html#JohnsonL86 http://www.aaai.org/Library/AAAI/1986/aaai86-101.php