@inproceedings{STOC-1969-Spira,
	author        = "Philip M. Spira",
	booktitle     = "{Proceedings of the First Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800169.805443",
	pages         = "271--272",
	publisher     = "{ACM}",
	title         = "{On the Computation Time of Certain Classes of Boolean Functions}",
	year          = 1969,
}