DERECH, V. D. On maximal stable orders on an inverse semigroup of finite rank with zero. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 8, p. 1035–1041, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3221. Acesso em: 5 dec. 2025.