BADE, W. G.; CURTIS, P. C. Jr.; LAURSEN, K. B. Automatic continuity in algebras of differentiable functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 40, p. 249–270, 1977. DOI: 10.7146/math.scand.a-11693. Disponível em: https://www.mscand.dk/article/view/11693. Acesso em: 5 dec. 2025.