Martin Kardos Franz J. Rammig Model Based Formal Verification of Distributed Production Control Systems. 451-473 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3147&spage=451 2004 conf/dfg/2004 SoftSpez Final Report db/conf/dfg/softspez2004.html#KardosR04