RODIN, B.; WARSCHAWSKI, S. E. Extremal length and the boundary behavior of conformal mappings. Annales Fennici Mathematici, [S. l.], v. 2, n. 1, p. 467–500, 1976. DOI: 10.5186/aasfm.1976.0231. Disponível em: https://afm.journal.fi/article/view/134310. Acesso em: 7 may. 2024.