@inproceedings{POPL-1999-MoranS,
	author        = "Andrew Moran and David Sands",
	booktitle     = "{Proceedings of the 26th Symposium on Principles of Programming Languages}",
	doi           = "10.1145/292540.292547",
	editor        = "Andrew W. Appel and Alex Aiken",
	isbn          = "1-58113-095-3",
	pages         = "43--56",
	publisher     = "{ACM}",
	title         = "{Improvement in a Lazy Context: An Operational Theory for Call-by-Need}",
	year          = 1999,
}