SAGMAN, N. Non-convexity of extremal length. Annales Fennici Mathematici, [S. l.], v. 48, n. 2, p. 691–702, 2023. DOI: 10.54330/afm.138339. Disponível em: https://afm.journal.fi/article/view/138339. Acesso em: 4 dec. 2024.