Hartmut Ehrig Reiko Heckel Grzegorz Rozenberg Gabriele Taentzer Graph Transformations, 4th International Conference, ICGT 2008, Leicester, United Kingdom, September 7-13, 2008. Proceedings 5214 2008 978-3-540-87404-1 ICGT Lecture Notes in Computer Science Springer db/conf/gg/icgt2008.html