José Carlos Costa. Canonical forms for free κ-semigroups. Discrete Mathematics & Theoretical Computer Science, 16(1):159-178, 2014. [doi]
@article{Costa14-0,
title = {Canonical forms for free κ-semigroups},
author = {José Carlos Costa},
year = {2014},
url = {http://www.dmtcs.org/dmtcs-ojs/index.php/dmtcs/article/view/2373},
researchr = {https://researchr.org/publication/Costa14-0},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics & Theoretical Computer Science},
volume = {16},
number = {1},
pages = {159-178},
}