BAKER, Andrew; RICHTER, Birgit. Quasisymmetric functions from a topological point of view. Mathematica Scandinavica, Berkeley, CA, United States, v. 103, n. 2, p. 208–242, 2008. DOI: 10.7146/math.scand.a-15078. Disponível em: https://journals.msp.org/mscand/article/view/619. Acesso em: 24 jul. 2026.