GARDINER, S. J.; GHERGU, M. Champagne subregions of the unit ball with unavoidable bubbles. Annales Fennici Mathematici, [S. l.], v. 35, n. 1, p. 321–329, 2010. DOI: 10.5186/aasfm.2010.3520. Disponível em: https://afm.journal.fi/article/view/135310. Acesso em: 25 nov. 2024.