MAITANI, F.; ISHIDA, H. Meromorphic functions of bounded valence on an open Riemann surface. Annales Fennici Mathematici, [S. l.], v. 16, n. 1, p. 125–130, 1991. DOI: 10.5186/aasfm.1991.1617. Disponível em: https://afm.journal.fi/article/view/134707. Acesso em: 25 nov. 2024.