@inproceedings{STOC-1973-Ladner,
	author        = "Richard E. Ladner",
	booktitle     = "{Proceedings of the Fifth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800125.804042",
	pages         = "122--129",
	publisher     = "{ACM}",
	title         = "{Polynomial Time Reducibility}",
	year          = 1973,
}