@inproceedings{STOC-1970-Lewis,
	author        = "Forbes D. Lewis",
	booktitle     = "{Proceedings of the Second Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800161.805145",
	pages         = "22--30",
	publisher     = "{ACM}",
	title         = "{Unsolvability Considerations in Computational Complexity}",
	year          = 1970,
}