UTTERSUD, Ulf. On M-ideals and the Alfsen-Effros structure topology. MATHEMATICA SCANDINAVICA, [S. l.], v. 43, p. 369–381, 1978. DOI: 10.7146/math.scand.a-11792. Disponível em: https://tidsskrift.dk/math/article/view/11792. Acesso em: 14 aug. 2026.