FOSSUM, Robert. Injective Moduls over Krull Orders. Mathematica Scandinavica, Berkeley, CA, United States, v. 28, p. 233–246, 1971. DOI: 10.7146/math.scand.a-11020. Disponível em: https://journals.msp.org/mscand/article/view/2279. Acesso em: 25 jul. 2026.