BATÍKOVÁ, Barbora; KEPKA, Tom´aˇs; NˇEMEC, Petr. A CONSTRUCTION OF CONGRUENCE-SIMPLE SEMIRINGS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 40, p. 633–655, 2018. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6976. Acesso em: 7 oct. 2026.