BUSEMANN, H.; PETTY, C. M. Problems on convex bodies. Mathematica Scandinavica, Berkeley, CA, United States, v. 4, p. 88–94, 1956. DOI: 10.7146/math.scand.a-10457. Disponível em: https://journals.msp.org/mscand/article/view/2869. Acesso em: 25 jul. 2026.