LEHTINEN, M. On maximal and minimal quasisymmetric functions on an interval. Annales Fennici Mathematici, [S. l.], v. 12, n. 1, p. 77–83, 1987. DOI: 10.5186/aasfm.1987.1218. Disponível em: https://afm.journal.fi/article/view/134586. Acesso em: 25 nov. 2024.