@inproceedings{DLT-2001-Esik,
	author        = "Zoltán Ésik",
	booktitle     = "{Revised Papers of the Fifth International Conference on Developments in Language Theory}",
	ee            = "http://link.springer.de/link/service/series/0558/bibs/2295/22950021.htm",
	isbn          = "3-540-43453-4",
	pages         = "21--36",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{The Equational Theory of Fixed Points with Applications to Generalized Language Theory}",
	volume        = 2295,
	year          = 2001,
}