@inproceedings{ICALP-1979-RozenbergV,
	author        = "Grzegorz Rozenberg and Dirk Vermeir",
	booktitle     = "{Proceedings of the Sixth Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/3-540-09510-1_38",
	isbn          = "3-540-09510-1",
	pages         = "479--488",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Extending the Notion of Finite Index}",
	volume        = 71,
	year          = 1979,
}