CATALAN, F. X.; TWEDDLE, I. Some Dense Barrelled Subspaces of $\omega$ and Incomplete $\phi$-Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 75, p. 185–194, 1994. DOI: 10.7146/math.scand.a-12514. Disponível em: https://journals.msp.org/mscand/article/view/1159. Acesso em: 24 jul. 2026.