@inproceedings{ICALP-1990-LucaV,
	author        = "Aldo de Luca and Stefano Varricchio",
	booktitle     = "{Proceedings of the 17th International Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/BFb0032023",
	isbn          = "3-540-52826-1",
	pages         = "74--87",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{On Non-Counting Regular Classes}",
	volume        = 443,
	year          = 1990,
}