@inproceedings{STOC-1974-CookR,
	author        = "Stephen A. Cook and Robert A. Reckhow",
	booktitle     = "{Proceedings of the Sixth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800119.803893",
	pages         = "135--148",
	publisher     = "{ACM}",
	title         = "{On the Lengths of Proofs in the Propositional Calculus}",
	year          = 1974,
}