Suzana Andova Tim A. C. Willemse Branching bisimulation for probabilistic systems: Characteristics and decidability. 325-355 2006 356 Theor. Comput. Sci. 3 http://dx.doi.org/10.1016/j.tcs.2006.02.010 db/journals/tcs/tcs356.html#AndovaW06