ALIJANI, Aliakbar. The $OP$ subgroup of a torsion-free LCA group. Sarajevo Journal of Mathematics, [S. l.], v. 22, n. 01, p. 41–43, 2026. DOI: 10.5644/SJM.22.01.03. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/687. Acesso em: 28 jul. 2026.