HELGASON, S. Some results on eigenfunctions on symmetric spaces and eigenspace representations. MATHEMATICA SCANDINAVICA, [S. l.], v. 41, p. 79–89, 1977. DOI: 10.7146/math.scand.a-11703. Disponível em: https://www.mscand.dk/article/view/11703. Acesso em: 29 apr. 2024.