EMTANDER, E.; FRÖBERG, R.; MOHAMMADI, F.; MORADI, S. Poincaré Series of some Hypergraph Algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 112, n. 1, p. 5–10, 2013. DOI: 10.7146/math.scand.a-15229. Disponível em: https://journals.msp.org/mscand/article/view/468. Acesso em: 24 jul. 2026.