GULLIKSEN, T. H. On the Length of Faithful Modules over Artinian Local Rings. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 78–82, 1972. DOI: 10.7146/math.scand.a-11413. Disponível em: https://www.mscand.dk/article/view/11413. Acesso em: 3 may. 2024.