KLÉN, R.; RASILA, A.; TALPONEN, J. On the smoothness of quasihyperbolic balls. Annales Fennici Mathematici, [S. l.], v. 42, n. 1, p. 439–452, 2017. DOI: 10.5186/aasfm.2017.4226. Disponível em: https://afm.journal.fi/article/view/135671. Acesso em: 22 nov. 2024.