DERECH, V. D. Structure of finite inverse semigroup with zero, in which every stable order is fundamental or antifundamental. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 1, p. 29–39, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2841. Acesso em: 5 dec. 2025.