EHRHARD, Antoine. Symétrisation dans l’espace de Gauss. Mathematica Scandinavica, Berkeley, CA, United States, v. 53, p. 281–301, 1983. DOI: 10.7146/math.scand.a-12035. Disponível em: https://journals.msp.org/mscand/article/view/1636. Acesso em: 25 jul. 2026.