BOGVAD, Rikard. Gorenstein rings with transcendental Poincaré-series. Mathematica Scandinavica, Berkeley, CA, United States, v. 53, p. 5–15, 1983. DOI: 10.7146/math.scand.a-12010. Disponível em: https://journals.msp.org/mscand/article/view/1659. Acesso em: 25 jul. 2026.