title: the heterogeneity problem and middleware technology : experiences with and performance of database gateways. authors: klaudia hergula , fernando de ferreira rezende. venue: vldb. year: 1998
title: the heterogeneity problem and middleware technology : experiences with and performance of database gateways. authors: fernando de ferreira rezende , klaudia hergula. venue: very large data bases. year: 1998