DUREN, P.; SCHOBER, G. Nonvanishing univalent functions III. Annales Fennici Mathematici, [S. l.], v. 10, n. 1, p. 139–147, 1985. DOI: 10.5186/aasfm.1985.1016. Disponível em: https://afm.journal.fi/article/view/134511. Acesso em: 25 nov. 2024.