LEVIN, Gerson. Large homomorphisms of local rings. Mathematica Scandinavica, Berkeley, CA, United States, v. 46, p. 209–215, 1980. DOI: 10.7146/math.scand.a-11863. Disponível em: https://journals.msp.org/mscand/article/view/1787. Acesso em: 25 jul. 2026.