@inproceedings{POPL-2015-Sangiorgi,
	author        = "Davide Sangiorgi",
	booktitle     = "{Proceedings of the 42nd Symposium on Principles of Programming Languages}",
	doi           = "10.1145/2676726.2676965",
	isbn          = "978-1-4503-3300-9",
	pages         = "421--432",
	publisher     = "{ACM}",
	title         = "{Equations, Contractions, and Unique Solutions}",
	year          = 2015,
}