@inproceedings{STOC-1969-AhoU,
	author        = "Alfred V. Aho and Jeffrey D. Ullman",
	booktitle     = "{Proceedings of the First Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800169.805425",
	pages         = "93--112",
	publisher     = "{ACM}",
	title         = "{Translations on a Context Free Grammar}",
	year          = 1969,
}