APTER, A. W. Indestructibility and the Levinski Property. Sarajevo Journal of Mathematics, [S. l.], v. 12, n. 1, p. 3–16, 2024. DOI: 10.5644/SJM.12.1.01. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/195. Acesso em: 15 oct. 2024.