@inproceedings{LICS-1992-LiguoroPS,
	author        = "Ugo de'Liguoro and Adolfo Piperno and Richard Statman",
	booktitle     = "{Proceedings of the Seventh Annual Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.1992.185557",
	isbn          = "0-8186-2735-2",
	pages         = "461--469",
	publisher     = "{IEEE Computer Society}",
	title         = "{Retracts in simply typed λβη-calculus}",
	year          = 1992,
}