@inproceedings{STOC-1969-Ogden,
	author        = "William F. Ogden",
	booktitle     = "{Proceedings of the First Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800169.805419",
	pages         = "31--42",
	publisher     = "{ACM}",
	title         = "{Intercalation Theorems for Stack Languages}",
	year          = 1969,
}