@inproceedings{ICALP-1982-DammG,
	author        = "Werner Damm and Andreas Goerdt",
	booktitle     = "{Proceedings of the Ninth Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/BFb0012764",
	isbn          = "3-540-11576-5",
	pages         = "141--153",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{An Automata-Theoretic Characterization of the OI-Hierarchy}",
	volume        = 140,
	year          = 1982,
}