REITEN, I.; FOSSUM, R. Commutative $n$-Gorenstein Rings. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 33–48, 1972. DOI: 10.7146/math.scand.a-11410. Disponível em: https://www.mscand.dk/article/view/11410. Acesso em: 5 may. 2024.