@inproceedings{mey-1969-preservation,
title = "On the Preservation of Context-Free Languages in a Level-Based System",
author = "Mey, Jacob",
booktitle = "{I}nternational {C}onference on {C}omputational {L}inguistics {COLING} 1969: Preprint No. 20",
month = sep,
year = "1969",
address = {S{\aa}nga S{\"a}by, Sweden},
url = "https://aclanthology.org/C69-2001",
}
Markdown (Informal)
[On the Preservation of Context-Free Languages in a Level-Based System](https://aclanthology.org/C69-2001) (Mey, COLING 1969)
ACL