@inproceedings{DAC-1980-Eastman,
	author        = "Charles M. Eastman",
	booktitle     = "{Proceedings of the 17th Design Automation Conference}",
	doi           = "10.1145/800139.804511",
	isbn          = "0-89791-020-6",
	pages         = "50--56",
	publisher     = "{ACM/IEEE}",
	title         = "{System facilities for CAD databases}",
	year          = 1980,
}