BAKER, A.; RICHTER, B. 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://www.mscand.dk/article/view/15078. Acesso em: 29 apr. 2024.