DIRDAL, G. Asymptotic Formulae for the Coefficients of a Class of Modular Forms. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 237–247, 1972. DOI: 10.7146/math.scand.a-11430. Disponível em: https://www.mscand.dk/article/view/11430. Acesso em: 2 may. 2024.