ANDERSON, D. D.; DOBBS, D. E.; ZAFRULLAH, M. Some applications of Zorn’s Lemma in algebra. Tamkang Journal of Mathematics, [S. l.], v. 40, n. 2, p. 139–150, 2009. DOI: 10.5556/j.tkjm.40.2009.463. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/463. Acesso em: 4 may. 2024.