@inproceedings{STOC-1974-Pratt,
	author        = "Vaughan R. Pratt",
	booktitle     = "{Proceedings of the Sixth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800119.803887",
	pages         = "80--83",
	publisher     = "{ACM}",
	title         = "{The Power of Negative Thinking in Multiplying Boolean Matrices}",
	year          = 1974,
}