SHELAH, S. . Preserving Old ([ω]N0, *) is Proper. Sarajevo Journal of Mathematics, [S. l.], v. 13, n. 2, p. 141–154, 2018. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/91. Acesso em: 15 oct. 2024.