YOST, David. The $n$-ball properties in real and complex Banach spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 50, p. 100–110, 1982. DOI: 10.7146/math.scand.a-11947. Disponível em: https://tidsskrift.dk/math/article/view/11947. Acesso em: 14 aug. 2026.