db/conf/sigbdp/GoodS90a.html David J. Good Robert W. Stone Expert Systems and Sales Strategies. 52-57 SIGBDP1990/P052.pdf 1990 conf/sigbdp/90 ACM SIGBDP Conference on Trends and Directions in Expert Systems http://doi.acm.org/10.1145/97709.97714 db/conf/sigbdp/sigbdp1990.html#GoodS90a