Frank Drewes Berthold Hoffmann Dirk Janssens Mark Minas Niels Van Eetvelde Shaped Generic Graph Transformation. 201-216 2007 AGTIVE http://dx.doi.org/10.1007/978-3-540-89020-1_15 conf/agtive/2007 db/conf/agtive/agtive2007.html#DrewesHJME07