DERECH, V. D. On Permutable Congruences on Antigroups of Finite Rank. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 3, p. 346–351, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3758. Acesso em: 6 dec. 2025.