@inproceedings{STOC-1972-JonesS,
	author        = "Neil D. Jones and Alan L. Selman",
	booktitle     = "{Proceedings of the Fourth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800152.804909",
	pages         = "157--167",
	publisher     = "{ACM}",
	title         = "{Turing Machines and the Spectra of First-Order Formulas with Equality}",
	year          = 1972,
}