@inproceedings{DAC-1989-HedenstiernaJ,
	author        = "Nils Hedenstierna and Kjell O. Jeppson",
	booktitle     = "{Proceedings of the 26th Design Automation Conference}",
	doi           = "10.1145/74382.74467",
	pages         = "508--512",
	publisher     = "{ACM Press}",
	title         = "{The Use of Inverse Layout Trees for Hierarchical Design Rule Checking}",
	year          = 1989,
}