HEYDARI, F.; BEHMARDI, D. A NOTE ON NON-FRAGMENTABLE SUBSPACE OF \(\ell_ ꝏ^{c}\)(Γ). Italian Journal of Pure and Applied Mathematics, [S. l.], v. 33, p. 133–138, 2014. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6285. Acesso em: 7 aug. 2026.