@inproceedings{KR-1998-Dornheim,
	author        = "Christoph Dornheim",
	booktitle     = "{Proceedings of the Sixth International Conference on Principles of Knowledge Representation and Reasoning}",
	pages         = "342--355",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Undecidability of Plane Polygonal Mereotopology}",
	year          = 1998,
}