HUSTAD, Otte. A Note on Inductive Limits of Linear Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 12, p. 163–166, 1963. DOI: 10.7146/math.scand.a-10679. Disponível em: https://journals.msp.org/mscand/article/view/2647. Acesso em: 25 jul. 2026.