Dan Barak David Harel Rami Marelly InterPlay: Horizontal Scale-up and Transition to Design in Scenario-Based Programming. 66-86 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3098&spage=66 2003 conf/ac/2003pn Lectures on Concurrency and Petri Nets db/conf/ac/acpn2003.html#BarakHM03