Bert Van Nuffelen Alvaro Cortés-Calabuig Marc Denecker Ofer Arieli Maurice Bruynooghe Data Integration Using ID-Logic. 67-81 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3084&spage=67 2004 conf/caise/2004 CAiSE db/conf/caise/caise2004.html#NuffelenCDAB04