VRETARE, L. Elementary spherical functions on symmetric spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 39, p. 343–358, 1976. DOI: 10.7146/math.scand.a-11667. Disponível em: https://www.mscand.dk/article/view/11667. Acesso em: 7 may. 2024.