UTTERSUD, Ulf. On M-ideals and the Alfsen-Effros structure topology. Mathematica Scandinavica, Berkeley, CA, United States, v. 43, p. 369–381, 1978. DOI: 10.7146/math.scand.a-11792. Disponível em: https://journals.msp.org/mscand/article/view/1855. Acesso em: 25 jul. 2026.