YOST, David. The $n$-ball properties in real and complex Banach spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 50, p. 100–110, 1982. DOI: 10.7146/math.scand.a-11947. Disponível em: https://journals.msp.org/mscand/article/view/1700. Acesso em: 25 jul. 2026.