@inproceedings{HCI-ACS-1993-HowerRB,
	author        = "Walter Hower and Manfred Rosendahl and Roland Berling",
	booktitle     = "{Proceedings of the Fifth International Conference on Human-Computer Interaction. Volume 1: Applications and Case Studies}",
	isbn          = "0-444-89540-X",
	pages         = "243--248",
	publisher     = "{Elsevier}",
	title         = "{Constraint Processing in Human Computer Interaction with an Emphasis on Intelligent CAD}",
	year          = 1993,
}