Grace SauLan Loo Tharam S. Dillon John Zeleznikow Kok-Huat Lee Enhancing Query Processing of Information Systems. 386-397 1996 conf/ismis/1996 ISMIS db/conf/ismis/ismis96.html#LooDZL96 http://dx.doi.org/10.1007/3-540-61286-6_163