EHRHARD, Antoine. Symétrisation dans l’espace de Gauss. MATHEMATICA SCANDINAVICA, [S. l.], v. 53, p. 281–301, 1983. DOI: 10.7146/math.scand.a-12035. Disponível em: https://tidsskrift.dk/math/article/view/12035. Acesso em: 13 aug. 2026.