Lijun Zhang Holger Hermanns Ernst Moritz Hahn Björn Wachter Time-bounded model checking of infinite-state continuous-time Markov chains. 98-107 2008 ACSD http://dx.doi.org/10.1109/ACSD.2008.4574601 conf/acsd/2008 db/conf/acsd/acsd2008.html#ZhangHHW08