Janusz A. Brzozowski, Elyot Grant, Jeffrey Shallit. Closures in Formal Languages and Kuratowski s Theorem. Int. J. Found. Comput. Sci., 22(2):301-321, 2011. [doi]
@article{BrzozowskiGS11,
title = {Closures in Formal Languages and Kuratowski s Theorem},
author = {Janusz A. Brzozowski and Elyot Grant and Jeffrey Shallit},
year = {2011},
doi = {10.1142/S0129054111008052},
url = {http://dx.doi.org/10.1142/S0129054111008052},
researchr = {https://researchr.org/publication/BrzozowskiGS11},
cites = {0},
citedby = {0},
journal = {Int. J. Found. Comput. Sci.},
volume = {22},
number = {2},
pages = {301-321},
}