@inproceedings{ICFP-2009-LiuCH,
	author        = "Hai Liu and Eric Cheng and Paul Hudak",
	booktitle     = "{Proceedings of the 14th International Conference on Functional Programming}",
	doi           = "10.1145/1596550.1596559",
	editor        = "Graham Hutton and Andrew P. Tolmach",
	isbn          = "978-1-60558-332-7",
	pages         = "35--46",
	publisher     = "{ACM}",
	title         = "{Causal commutative arrows and their optimization}",
	year          = 2009,
}