Herman Balsters Bert O. de Brock An Object-Oriented Framework for Reconciliation and Extraction in Heterogeneous Data Federations. 34-47 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3261&spage=34 2004 conf/advis/2004 ADVIS db/conf/advis/advis2004.html#BalstersB04