Avigdor Gal Eugeny Michailovsky Mati Golani Workflow Reconfiguration Using Chains. 18-19 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2889&spage=18 2003 conf/otm/2003 OTM Workshops db/conf/otm/otm2003.html#GalMG03