FIREY, Wm. J. $p$-Means of Convex Bodies. Mathematica Scandinavica, Berkeley, CA, United States, v. 10, p. 17–24, 1962. DOI: 10.7146/math.scand.a-10510. Disponível em: https://journals.msp.org/mscand/article/view/2678. Acesso em: 25 jul. 2026.