DERECH, V. D. Finite structurally uniform groups and commutative nilsemigroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 8, p. 1072–1084, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1618. Acesso em: 5 dec. 2025.