Alexander Okhotin. On the number of nonterminals in linear conjunctive grammars. Theoretical Computer Science, 320(2-3):419-448, 2004. [doi]
@article{Okhotin04:3,
title = {On the number of nonterminals in linear conjunctive grammars},
author = {Alexander Okhotin},
year = {2004},
doi = {10.1016/j.tcs.2004.03.002},
url = {http://dx.doi.org/10.1016/j.tcs.2004.03.002},
tags = {grammar},
researchr = {https://researchr.org/publication/Okhotin04%3A3},
cites = {0},
citedby = {0},
journal = {Theoretical Computer Science},
volume = {320},
number = {2-3},
pages = {419-448},
}