GLICKSBERG, I. On Two Consequences of a Theorem of Hoffman and Wermer. Mathematica Scandinavica, Berkeley, CA, United States, v. 23, p. 188–192, 1968. DOI: 10.7146/math.scand.a-10910. Disponível em: https://journals.msp.org/mscand/article/view/2447. Acesso em: 25 jul. 2026.