BADE, W. G.; CURTIS, P. C. Jr.; LAURSEN, K. B. Automatic continuity in algebras of differentiable functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 40, p. 249–270, 1977. DOI: 10.7146/math.scand.a-11693. Disponível em: https://journals.msp.org/mscand/article/view/1954. Acesso em: 25 jul. 2026.