Mokrane Bouzeghoub Bernadette Farias Lóscio Zoubida Kedad Ana Carolina Salgado Managing the Evolution of Mediation Queries. 22-37 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2888&spage=22 2003 conf/coopis/2003 CoopIS/DOA/ODBASE db/conf/coopis/coopis2003.html#BouzeghoubLKS03