Denis Caromel Luis Mateu Éric Tanter Sequential Object Monitors. 316-340 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3086&spage=316 2004 conf/ecoop/2004 ECOOP db/conf/ecoop/ecoop2004.html#CaromelMT04