Nina Aschenbrenner Leif Geiger Transforming Scene Graphs Using Triple Graph Grammars - A Practice Report. 32-43 2007 AGTIVE http://dx.doi.org/10.1007/978-3-540-89020-1_3 conf/agtive/2007 db/conf/agtive/agtive2007.html#AschenbrennerG07