@inproceedings{STOC-1984-Kozen,
	author        = "Dexter Kozen",
	booktitle     = "{Proceedings of the 16th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800057.808709",
	pages         = "428--435",
	publisher     = "{ACM}",
	title         = "{Pebblings, Edgings, and Equational Logic}",
	year          = 1984,
}