@inproceedings{KR-1989-Schmidt-Schauss,
	author        = "Manfred Schmidt-Schauß",
	booktitle     = "{Proceedings of the First International Conference on Principles of Knowledge Representation and Reasoning}",
	isbn          = "1-55860-032-9",
	pages         = "421--431",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Subsumption in KL-ONE is Undecidable}",
	year          = 1989,
}