@inproceedings{ICALP-v2-2013-KobeleS,
	author        = "Gregory M. Kobele and Sylvain Salvati",
	booktitle     = "{Proceedings of the 40th International Colloquium on Automata, Languages, and Programming, Part II}",
	doi           = "10.1007/978-3-642-39212-2_31",
	isbn          = "978-3-642-39211-5",
	pages         = "336--348",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{The IO and OI Hierarchies Revisited}",
	volume        = 7966,
	year          = 2013,
}