BRATTELI, Ola; KISHIMOTO, Akitaka; ROBINSON, Derek W. Approximately inner derivations. MATHEMATICA SCANDINAVICA, [S. l.], v. 103, n. 1, p. 141–160, 2008. DOI: 10.7146/math.scand.a-15074. Disponível em: https://tidsskrift.dk/math/article/view/15074. Acesso em: 13 aug. 2026.