PETER DANCHEV. WEAKLY UU RINGS. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 10, p. 1422–1428, 2023. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6004. Acesso em: 5 dec. 2025.