BRATTELI, Ola; KISHIMOTO, Akitaka; ROBINSON, Derek W. Approximately inner derivations. Mathematica Scandinavica, Berkeley, CA, United States, v. 103, n. 1, p. 141–160, 2008. DOI: 10.7146/math.scand.a-15074. Disponível em: https://journals.msp.org/mscand/article/view/623. Acesso em: 24 jul. 2026.