JOHANSEN, T. B. Convergence of derivations on nearest algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 58, p. 46–54, 1986. DOI: 10.7146/math.scand.a-12128. Disponível em: https://www.mscand.dk/article/view/12128. Acesso em: 4 may. 2024.