Stephen L. Bloom, Zoltán Ésik. The equational theory of regular words. Inf. Comput., 197(1-2):55-89, 2005. [doi]
@article{BloomE05,
title = {The equational theory of regular words},
author = {Stephen L. Bloom and Zoltán Ésik},
year = {2005},
doi = {10.1016/j.ic.2005.01.004},
url = {http://dx.doi.org/10.1016/j.ic.2005.01.004},
researchr = {https://researchr.org/publication/BloomE05},
cites = {0},
citedby = {0},
journal = {Inf. Comput.},
volume = {197},
number = {1-2},
pages = {55-89},
}