@inproceedings{ICFP-2011-AhnS,
	author        = "Ki Yung Ahn and Tim Sheard",
	booktitle     = "{Proceedings of the 16th International Conference on Functional Programming}",
	doi           = "10.1145/2034773.2034807",
	editor        = "Manuel M. T. Chakravarty and Zhenjiang Hu and Olivier Danvy",
	isbn          = "978-1-4503-0865-6",
	pages         = "234--246",
	publisher     = "{ACM}",
	title         = "{A hierarchy of mendler style recursion combinators: taming inductive datatypes with negative occurrences}",
	year          = 2011,
}