title: optimizing queries across diverse data sources vldb 1997. authors: l haas , d kossmann , e wimmers , j yang. venue: nan. year: nan
title: optimizing queries across diverse data sources lm hass , d kossmann , el wimmers , j yang , l raschid proceedings of the 23rd vldb conference , athens , greece , acm & hellip ; ,. authors: nan. venue: nan. year: nan