Jürgen Dassow, Ronny Harbich. Descriptional Complexity of Union and Star on Context-Free Languages. Journal of Automata, Languages and Combinatorics, 17(2-4):123-143, 2012.
@article{DassowH12-0,
title = {Descriptional Complexity of Union and Star on Context-Free Languages},
author = {Jürgen Dassow and Ronny Harbich},
year = {2012},
researchr = {https://researchr.org/publication/DassowH12-0},
cites = {0},
citedby = {0},
journal = {Journal of Automata, Languages and Combinatorics},
volume = {17},
number = {2-4},
pages = {123-143},
}