FOSSUM, Robert. Duality Over Gorenstein Rings. Mathematica Scandinavica, Berkeley, CA, United States, v. 26, p. 165–176, 1970. DOI: 10.7146/math.scand.a-10975. Disponível em: https://journals.msp.org/mscand/article/view/2349. Acesso em: 25 jul. 2026.