MAASS, H. Spherical Functions and Quadratic forms. The Journal of the Indian Mathematical Society, [S. l.], v. 20, n. 1-3, p. 117–162, 1956. DOI: 10.18311/jims/1956/16988. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16988. Acesso em: 1 may. 2024.