KORTRAM, R.; OLLI, T. On the second coefficient region for bounded univalent functions. Annales Fennici Mathematici, [S. l.], v. 1, n. 1, p. 155–175, 1975. DOI: 10.5186/aasfm.1975.0106. Disponível em: https://afm.journal.fi/article/view/134250. Acesso em: 25 nov. 2024.