@inproceedings{ICALP-1983-CulikS,
	author        = "Karel Culik II and Arto Salomaa",
	booktitle     = "{Proceedings of the 10th Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/BFb0036904",
	isbn          = "3-540-12317-2",
	pages         = "137--146",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Ambiguity and Decision Problems Concerning Number Systems}",
	volume        = 154,
	year          = 1983,
}