@inproceedings{LICS-2001-ArnoldLM,
	author        = "André Arnold and Giacomo Lenzi and Jerzy Marcinkowski",
	booktitle     = "{Proceedings of the 16th Annual IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2001.932492",
	isbn          = "0-7695-1281-X",
	pages         = "157--166",
	publisher     = "{IEEE Computer Society}",
	title         = "{The Hierarchy inside Closed Monadic Σ₁ Collapses on the Infinite Binary Tree}",
	year          = 2001,
}