@inproceedings{WAGA-1990-AkkerMT,
	author        = "Rieks op den Akker and Borivoj Melichar and Jorma Tarhio",
	booktitle     = "{Proceedings of the International Conference on Attribute Grammars and their Applications}",
	doi           = "10.1007/3-540-53101-7_2",
	isbn          = "3-540-53101-7",
	pages         = "13--28",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{The Hierarchy of LR-Attributed Grammars}",
	volume        = 461,
	year          = 1990,
}