NG, K.- fu. On a Theorem of Dixmier. MATHEMATICA SCANDINAVICA, [S. l.], v. 29, p. 279–280, 1971. DOI: 10.7146/math.scand.a-11054. Disponível em: https://www.mscand.dk/article/view/11054. Acesso em: 28 apr. 2024.