Leopoldo E. Bertossi Loreto Bravo Consistent Query Answers in Virtual Data Integration Systems. 42-83 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3300&spage=42 2005 conf/dagstuhl/2005into Inconsistency Tolerance db/conf/dagstuhl/into2005.html#BertossiB05