@article{GT-VMT-2001-HeckelK,
	author        = "Reiko Heckel and Jochen Malte Küster",
	doi           = "10.1016/S1571-0661(04)00177-X",
	journal       = "{Electronic Notes in Theoretical Computer Science}",
	number        = 3,
	pages         = "257--265",
	title         = "{Behavioral Constraints for Visual Models}",
	volume        = 50,
	year          = 2001,
}