BRUN, Morten; RÖMER, Tim. On algebras associated to partially ordered sets. Mathematica Scandinavica, Berkeley, CA, United States, v. 103, n. 2, p. 169–185, 2008. DOI: 10.7146/math.scand.a-15076. Disponível em: https://journals.msp.org/mscand/article/view/621. Acesso em: 24 jul. 2026.