@inproceedings{STOC-1969-Borodin,
	author        = "Allan Borodin",
	booktitle     = "{Proceedings of the First Annual ACM Symposium on Theory of Computing}",
	pages         = "67--78",
	publisher     = "{ACM}",
	title         = "{Complexity Classes of Recursive Functions and the Existence of Complexity Gaps}",
	year          = 1969,
}