Jan Chomicki Jerzy Marcinkowski On the Computational Complexity of Minimal-Change Integrity Maintenance in Relational Databases. 119-150 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3300&spage=119 2005 conf/dagstuhl/2005into Inconsistency Tolerance db/conf/dagstuhl/into2005.html#ChomickiM05