@article{CIAA-J-2008-Pighizzini09,
	author        = "Giovanni Pighizzini",
	doi           = "10.1142/S0129054109006784",
	journal       = "{International Journal of Foundations of Computer Science}",
	number        = 4,
	pages         = "629--645",
	publisher     = "{World Scientific}",
	title         = "{Deterministic Pushdown Automata and Unary Languages}",
	volume        = 20,
	year          = 2009,
}