SJÖGREN, R. On the Regularity of Graded $k$-Algebras of Krull Dimension $\leqq 1$. MATHEMATICA SCANDINAVICA, [S. l.], v. 71, p. 167–172, 1992. DOI: 10.7146/math.scand.a-12419. Disponível em: https://www.mscand.dk/article/view/12419. Acesso em: 28 apr. 2024.