Heydari, F., and D. Behmardi. “A NOTE ON NON-FRAGMENTABLE SUBSPACE OF \(\ell_ ꝏ^{c}\)(Γ)”. Italian Journal of Pure and Applied Mathematics 33 (December 29, 2014): 133–138. Accessed August 7, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/6285.