Inna Pivkina Enrico Pontelli Tran Cao Son Revising Knowledge in Multi-agent Systems Using Revision Programming with Preferences. 134-158 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3259&spage=134 2004 conf/clima/2004 CLIMA IV db/conf/clima/clima2004.html#PivkinaPS04