title: efficient integration and aggregation of historical information sigmod conference. authors: amr el abbadi , mirek riedewald , divyakant agrawal. venue: nan. year: 2002.0
title: on wrapping query languages and efficient xml integration vassilis christophides , sophie cluet , j &#233; r &#466; me sim &#232; on 2000. authors: nan. venue: international conference on management of data. year: nan