@inproceedings{STOC-1974-CourcelleV,
	author        = "Bruno Courcelle and Jean Vuillemin",
	booktitle     = "{Proceedings of the Sixth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800119.803880",
	pages         = "13--26",
	publisher     = "{ACM}",
	title         = "{Semantics and Axiomatics of a Simple Recursive Language}",
	year          = 1974,
}