AL-JARRAH, Heyam H.; AL ZOUBI, Khalid Y. P-EXPANDABLE SPACES. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 41, p. 497–507, 2019. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7103. Acesso em: 17 oct. 2026.