@article{AFL-J-2008-KlimaP10a,
	author        = "Ondrej Klíma and Libor Polák",
	doi           = "10.1142/S0129054110007544",
	journal       = "{International Journal of Foundations of Computer Science}",
	number        = 5,
	pages         = "761--780",
	publisher     = "{World Scientific}",
	title         = "{Literally Idempotent Languages and their Varieties — Two Letter Case}",
	volume        = 21,
	year          = 2010,
}