FLETCHER, A.; WALLIS, B. The orbits of generalized derivatives. Annales Fennici Mathematici, [S. l.], v. 44, n. 1, p. 485–495, 2019. DOI: 10.5186/aasfm.2019.4429. Disponível em: https://afm.journal.fi/article/view/135804. Acesso em: 14 apr. 2025.