Thierry Cachat Jacques Duparc Wolfgang Thomas Solving Pushdown Games with a Sigma<sub>3</sub> Winning Condition. 322-336 2002 conf/csl/2002 CSL http://link.springer.de/link/service/series/0558/bibs/2471/24710322.htm db/conf/csl/csl2002.html#CachatDT02