LEHTINEN, M. Quasisymmetric functions with dilatation one. Annales Fennici Mathematici, [S. l.], v. 3, n. 2, p. 223–227, 1976. DOI: 10.5186/aasfm.1977.0314. Disponível em: https://afm.journal.fi/article/view/134319. Acesso em: 26 apr. 2025.