Leonardo Mendonça de Moura Sam Owre Harald Rueß John M. Rushby Natarajan Shankar Maria Sorea Ashish Tiwari 496-500 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3114&spage=496 2004 conf/cav/2004 CAV db/conf/cav/cav2004.html#MouraORRSST04