@inproceedings{STOC-1971-Constable,
	author        = "Robert L. Constable",
	booktitle     = "{Proceedings of the Third Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800157.805035",
	pages         = "24--39",
	publisher     = "{ACM}",
	title         = "{Loop Schemata}",
	year          = 1971,
}