TOPPILA, S. On the spherical derivative of a meromorphic function with a Nevanlinna deficient value. Annales Fennici Mathematici, [S. l.], v. 8, n. 2, p. 235–245, 1983. DOI: 10.5186/aasfm.1983.0825. Disponível em: https://afm.journal.fi/article/view/134469. Acesso em: 25 nov. 2024.