The Isomorphism Theorem of Regular Bisimple $ω^2$-Semigroups. Communications in Mathematical Research, [S. l.], v. 30, n. 2, p. 131–138, 2021. DOI: 10.13447/j.1674-5647.2014.02.04. Disponível em: https://www.global-sci.com/index.php/cmr/article/view/8804. Acesso em: 27 feb. 2026.