@article{GT-VMT-2001-KothM,
	author        = "Oliver Köth and Mark Minas",
	doi           = "10.1016/S1571-0661(04)00182-3",
	journal       = "{Electronic Notes in Theoretical Computer Science}",
	number        = 3,
	pages         = "295--301",
	title         = "{Abstraction in Graph-Transformation Based Diagram Editors}",
	volume        = 50,
	year          = 2001,
}