@inproceedings{DLT-2003-AnselmoM,
	author        = "Marcella Anselmo and Maria Madonia",
	booktitle     = "{Proceedings of the Seventh International Conference on Developments in Language Theory}",
	doi           = "10.1007/3-540-45007-6_9",
	isbn          = "3-540-40434-1",
	pages         = "122--133",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Covering Problems from a Formal Language Point of View}",
	volume        = 2710,
	year          = 2003,
}