BRIEM, Eggert. Enlarging a subspace of $C(X)$ without changing the Choquet boundary. MATHEMATICA SCANDINAVICA, [S. l.], v. 44, p. 218–224, 1979. DOI: 10.7146/math.scand.a-11805. Disponível em: https://tidsskrift.dk/math/article/view/11805. Acesso em: 14 aug. 2026.