Paulo Henrique M. Maia Jeff Kramer Sebastián Uchitel Nabor C. Mendonça Towards accurate probabilistic models using state refinement. 281-284 2009 ESEC/SIGSOFT FSE http://doi.acm.org/10.1145/1595696.1595742 conf/sigsoft/2009 db/conf/sigsoft/fse2009.html#MaiaKUM09