EDÉN, Viggo. Distributions Invariant under the Group of Complex Orthogonal Transformations. Mathematica Scandinavica, Berkeley, CA, United States, v. 14, p. 75–89, 1964. DOI: 10.7146/math.scand.a-10707. Disponível em: https://journals.msp.org/mscand/article/view/2597. Acesso em: 25 jul. 2026.