Sukho Lee Hideko S. Kunii Won Kim In Sup Paik Yahiko Kambayashi International Symposium on Database Systems for Advanced Applications, Seoul, Korea, April 10-12, 1989 Dept. of Computer Science, KAIST, P.O. Box 150, ChongRyang, Seoul, 131-650, Korea db/conf/dasfaa/dasfaa89.html 1989