BATÍKOVÁ, Barbora; DVOŘÁKOVÁ, Šárka; TRCH, Milan. SEMIGROUP DISTANCES OF FINITE GROUPOIDS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 32, p. 547–560, 2014. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6174. Acesso em: 26 jul. 2026.