Guilherme Rangel Barbara König Hartmut Ehrig Deriving Bisimulation Congruences in the Presence of Negative Application Conditions. 413-427 2008 FoSSaCS http://dx.doi.org/10.1007/978-3-540-78499-9_29 conf/fossacs/2008 db/conf/fossacs/fossacs2008.html#RangelKE08