STREBEL, K. On quadratic differentials with closed trajectories on open Riemann surfaces. Annales Fennici Mathematici, [S. l.], v. 2, n. 1, p. 533–551, 1976. DOI: 10.5186/aasfm.1976.0233. Disponível em: https://afm.journal.fi/article/view/134312. Acesso em: 25 nov. 2024.