Orna Grumberg Tamir Heyman Assaf Schuster A Work-Efficient Distributed Algorithm for Reachability Analysis. 54-66 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2725&spage=54 2003 conf/cav/2003 CAV db/conf/cav/cav2003.html#GrumbergHS03