GULLIKSEN, T. H. On the deviations of a local ring. Mathematica Scandinavica, Berkeley, CA, United States, v. 47, p. 5–20, 1980. DOI: 10.7146/math.scand.a-11872. Disponível em: https://journals.msp.org/mscand/article/view/1775. Acesso em: 25 jul. 2026.