Gianfranco Ciardo Radu Siminiceanu Structural Symbolic CTL Model Checking of Asynchronous Systems. 40-53 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2725&spage=40 2003 conf/cav/2003 CAV db/conf/cav/cav2003.html#CiardoS03