Yuan Liu Baowen Xu Zhenqiang Chen Detecting Deadlock in Ada Rendezvous Flow Structure Based on Process Algebra. 262-274 2002 conf/icfem/2002 ICFEM http://link.springer.de/link/service/series/0558/bibs/2495/24950262.htm db/conf/icfem/icfem2002.html#LiuXC02