@inproceedings{ICALP-1991-Thomas,
	author        = "Wolfgang Thomas",
	booktitle     = "{Proceedings of the 18th International Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/3-540-54233-7_154",
	isbn          = "3-540-54233-7",
	pages         = "441--454",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{On Logics, Tilings, and Automata}",
	volume        = 510,
	year          = 1991,
}