Cong Tian Zhenhua Duan Propositional Projection Temporal Logic, Bchi Automata and omega-Regular Expressions. 47-58 2008 TAMC http://dx.doi.org/10.1007/978-3-540-79228-4_4 conf/tamc/2008 db/conf/tamc/tamc2008.html#TianD08