Duncan Clarke Thierry Jéron Vlad Rusu Elena Zinovieva STG: A Symbolic Test Generation Tool. 470-475 2002 conf/tacas/2002 TACAS http://link.springer.de/link/service/series/0558/bibs/2280/22800470.htm db/conf/tacas/tacas2002.html#ClarkeJRZ02