Mark Lawford Vera Pantelic Hong Zhang Towards Integrated Verification of Timed Transition Models. 75-110 2006 70 Fundam. Inform. 1-2 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=70&issue=1&spage=75 db/journals/fuin/fuin70.html#LawfordPZ06