DANCHEV, P. V.; KEEF, P. On properties of n-totally projective abelian p -groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 6, p. 766–771, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2615. Acesso em: 5 dec. 2025.