TANABE, M. Hurwitz’ theorem and a genararization for holomorphic maps of closed Riemann surfaces. Annales Fennici Mathematici, [S. l.], v. 34, n. 2, p. 391–399, 2009. Disponível em: https://afm.journal.fi/article/view/135275. Acesso em: 25 nov. 2024.