HUSTAD, O. On Positive and Continuous Extension of Positive Functionals Defined over Dense Subspaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 7, p. 392–404, 1959. DOI: 10.7146/math.scand.a-10586. Disponível em: https://www.mscand.dk/article/view/10586. Acesso em: 28 apr. 2024.