@inproceedings{PEPM-2007-EllnerT,
	author        = "Stephan Ellner and Walid Taha",
	booktitle     = "{Proceedings of the 12th Workshop on Partial Evaluation and Semantics-Based Program Manipulation}",
	doi           = "10.1145/1244381.1244402",
	isbn          = "978-1-59593-620-2",
	pages         = "122--133",
	publisher     = "{ACM}",
	title         = "{The semantics of graphical languages}",
	year          = 2007,
}