GEVIRTZ, J. On the difference quotients of an analytic function. Annales Fennici Mathematici, [S. l.], v. 12, n. 2, p. 237–259, 1987. DOI: 10.5186/aasfm.1987.1210. Disponível em: https://afm.journal.fi/article/view/134600. Acesso em: 25 nov. 2024.