Graph Transformations Second International Conference, ICGT 2004, Rome, Italy, September 28 - October 1, 2004, Proceedings - Ehrig, Hartmut; Ehrig, Hartmut; Engels, Gregor; Engels, Gregor; Parisi-Presicce, Francesco; Parisi-Presicce, Francesco; Rozenberg, Grzegorz; Rozenberg, Grzegorz (Springer Berlin Heidelberg : Imprint: Springer, 2004)