PROTASOV, I. V. Absolute decomposability of the group of rational numbers. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 12, p. 1704–1707, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5192. Acesso em: 5 dec. 2025.