@inproceedings{CSL-2001-PowerT,
	author        = "John Power and Konstantinos Tourlas",
	booktitle     = "{Proceedings of the 10th EACSL Annual Conference / 15th International Workshop on Computer Science Logic}",
	doi           = "10.1007/3-540-44802-0_11",
	isbn          = "3-540-42554-3",
	pages         = "145--159",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{An Algebraic Foundation for Higraphs}",
	volume        = 2142,
	year          = 2001,
}