ALKAN, M.; Ӧneş O. The radical formula for noncommutative rings. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 9, p. 1241–1248, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1512. Acesso em: 5 dec. 2025.