Edmund M. Clarke Muralidhar Talupur Helmut Veith Proving Ptolemy Right: The Environment Abstraction Framework for Model Checking Concurrent Systems. 33-47 2008 TACAS http://dx.doi.org/10.1007/978-3-540-78800-3_4 conf/tacas/2008 db/conf/tacas/tacas2008.html#ClarkeTV08