Armin Biere Edmund M. Clarke Yunshan Zhu Multiple State and Single State Tableaux for Combining Local and Global Model Checking. 163-179 http://link.springer.de/link/service/series/0558/bibs/1710/17100163.htm 1999 conf/birthday/1999langmaack Correct System Design db/conf/birthday/langmaack1999.html#BiereCZ99