title: optimizing queries with universal quantification in object-oriented and object-relational databases guido moerkotte , jens claußen , klaus peithner , alfons kemper vldb 1997. authors: nan. venue: nan. year: nan
title: bulk-loading techniques for object databases and an application to relational data very large data bases 1998. authors: sihem amer-yahia , sophie cluet , claude delobel. venue: nan. year: nan