@Misc{sage-semigroup,
author =   {Hivert, Florent and Saliola, Franco and
Thiéry, Nicolas~M. et al.},
title =    {{sage-semigroup}: A semigroup (representation) theory library for
                  SageMath},
howpublished = {\url{https://github.com/nthiery/sage-semigroups/}},
year = {2012--2018},
}