@inproceedings{STOC-1979-GurariI,
	author        = "Eitan M. Gurari and Oscar H. Ibarra",
	booktitle     = "{Proceedings of the 11th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800135.804407",
	pages         = "142--152",
	publisher     = "{ACM}",
	title         = "{The Complexity of the Equivalence Problem for Counter Machines, Semilinear Sets, and Simple Programs}",
	year          = 1979,
}