CHOI, S. Betti numbers and the integral closure of ideals. MATHEMATICA SCANDINAVICA, [S. l.], v. 66, p. 173–184, 1990. DOI: 10.7146/math.scand.a-12302. Disponível em: https://www.mscand.dk/article/view/12302. Acesso em: 14 apr. 2025.