Jochen Malte Küster Christian Gerth Gregor Engels Dependent and Conflicting Change Operations of Process Models. 158-173 2009 ECMDA-FA http://dx.doi.org/10.1007/978-3-642-02674-4_12 conf/ecmdafa/2009 db/conf/ecmdafa/ecmdafa2009.html#KusterGE09