KOBAYASHI, Yuji. The Hilbert series of some graded algebras and the Poincaré series of some local rings. Mathematica Scandinavica, Berkeley, CA, United States, v. 42, p. 19–33, 1978. DOI: 10.7146/math.scand.a-11732. Disponível em: https://journals.msp.org/mscand/article/view/1911. Acesso em: 25 jul. 2026.