@inproceedings{ICGT-2008-Stevens,
	author        = "Perdita Stevens",
	booktitle     = "{Proceedings of the Fourth International Conference on Graph Transformations}",
	doi           = "10.1007/978-3-540-87405-8_1",
	editor        = "Hartmut Ehrig and Reiko Heckel and Grzegorz Rozenberg and Gabriele Täntzer",
	isbn          = "978-3-540-87404-1",
	pages         = "1--17",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Towards an Algebraic Theory of Bidirectional Transformations}",
	volume        = 5214,
	year          = 2008,
}