@inproceedings{POPL-2011-HofmannPW,
	author        = "Martin Hofmann and Benjamin C. Pierce and Daniel Wägner",
	booktitle     = "{Proceedings of the 38th Symposium on Principles of Programming Languages}",
	doi           = "10.1145/1926385.1926428",
	editor        = "Thomas Ball and Mooly Sagiv",
	isbn          = "978-1-4503-0490-0",
	pages         = "371--384",
	publisher     = "{ACM}",
	title         = "{Symmetric lenses}",
	year          = 2011,
}