@inproceedings{DAC-1989-SiepmannZ,
	author        = "Ernst Siepmann and Gerhard Zimmermann",
	booktitle     = "{Proceedings of the 26th Design Automation Conference}",
	doi           = "10.1145/74382.74537",
	pages         = "814--817",
	publisher     = "{ACM Press}",
	title         = "{An Object-Oriented Datamodel for the VLSI Design System PLAYOUT}",
	year          = 1989,
}