The primitives of the Hopf algebra of noncommutative symmetric functions. São Paulo Journal of Mathematical Sciences, [S. l.], v. 1, n. 2, p. 175–202, 2007. DOI: 10.11606/issn.2316-9028.v1i2p175-202. Disponível em: https://periodicos.usp.br/spjournal/article/view/7.. Acesso em: 15 abr. 2025.