STEFANSSON, Jón R. On a Problem of J. Dixmier Concerning Ideals in a von Neumann Algebra. MATHEMATICA SCANDINAVICA, [S. l.], v. 24, p. 111–112, 1969. DOI: 10.7146/math.scand.a-10924. Disponível em: https://tidsskrift.dk/math/article/view/10924. Acesso em: 14 aug. 2026.