BAKER, Andrew; RICHTER, Birgit. Quasisymmetric functions from a topological point of view. MATHEMATICA SCANDINAVICA, [S. l.], v. 103, n. 2, p. 208–242, 2008. DOI: 10.7146/math.scand.a-15078. Disponível em: https://tidsskrift.dk/math/article/view/15078. Acesso em: 14 aug. 2026.