PROTASOV, I. V. Absolutely decomposable groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 3, p. 383–392, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5335. Acesso em: 5 dec. 2025.