ALBRECHT, Ulrich. ℵ1-A-coseperable groups. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 60, n. 4, p. 493–507, 2015. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5819. Acesso em: 5 feb. 2025.