Gianina Georgescu
On the Index of Pure Context-free Grammars and Languages
DLT, 1993.
@inproceedings{DLT-1993-Georgescu,
author = "Gianina Georgescu",
booktitle = "{Proceedings of the First International Conference on Developments in Language Theory}",
isbn = "981-02-1645-9",
pages = "60--69",
publisher = "{World Scientific}",
title = "{On the Index of Pure Context-free Grammars and Languages}",
year = 1993,
}