@inproceedings{SAC-2006-IgarashiN,
	author        = "Atsushi Igarashi and Hideshi Nagira",
	booktitle     = "{Proceedings of the 21st Symposium on Applied Computing}",
	doi           = "10.1145/1141277.1141610",
	editor        = "Hisham Haddad",
	isbn          = "1-59593-108-2",
	pages         = "1435--1441",
	publisher     = "{ACM}",
	title         = "{Union types for object-oriented programming}",
	year          = 2006,
}