@inproceedings{OOPSLA-2009-Cook,
	author        = "William R. Cook",
	booktitle     = "{Proceedings of the 24th Conference on Object-Oriented Programming, Systems, Languages and Applications}",
	doi           = "10.1145/1640089.1640133",
	editor        = "Shail Arora and Gary T. Leavens",
	isbn          = "978-1-60558-766-0",
	pages         = "557--572",
	publisher     = "{ACM}",
	title         = "{On understanding data abstraction, revisited}",
	year          = 2009,
}