GULLIKSEN, T. H. A Change of Ring Theorem with Applications to Poincaré Series and Intersection Multiplicity. MATHEMATICA SCANDINAVICA, [S. l.], v. 34, p. 167–183, 1974. DOI: 10.7146/math.scand.a-11518. Disponível em: https://www.mscand.dk/article/view/11518. Acesso em: 29 mar. 2024.