@inproceedings{CHI-1989-Zanden,
	author        = "Bradley T. Vander Zanden",
	booktitle     = "{Proceedings of the Seventh ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/67449.67513",
	pages         = "325--330",
	publisher     = "{ACM}",
	title         = "{Constraint grammars-a new model for specifying graphical applications}",
	year          = 1989,
}