Santtu Toivonen Heikki Helin Representing Interaction Protocols in DAML. 310-321 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2926&spage=310 2003 conf/amkm/2003 AMKM db/conf/amkm/amkm2003.html#ToivonenH03