@inproceedings{DAC-1976-CiampiN,
	author        = "Peter L. Ciampi and J. D. Nash",
	booktitle     = "{Proceedings of the 13th Design Automation Conference}",
	doi           = "10.1145/800146.804827",
	pages         = "290--294",
	publisher     = "{ACM}",
	title         = "{Concepts in CAD data base structures}",
	year          = 1976,
}