@inproceedings{POPL-1978-Oppen,
	author        = "Derek C. Oppen",
	booktitle     = "{Conference Record of the Fifth Annual Symposium on Principles of Programming Languages}",
	doi           = "10.1145/512760.512776",
	editor        = "Alfred V. Aho and Stephen N. Zilles and Thomas G. Szymanski",
	pages         = "151--157",
	publisher     = "{ACM Press}",
	title         = "{Reasoning about Recursively Defined Data Structures}",
	year          = 1978,
}