Jason Baumgartner Hari Mony Scalable liveness checking via property-preserving transformations. 1680-1685 2009 DATE http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=5090609&arnumber=5090933&count=326&index=319 conf/date/2009 db/conf/date/date2009.html#BaumgartnerM09