KOLBERG, O. Note on Ramanujan’s Function $\tau(n)$. Mathematica Scandinavica, Berkeley, CA, United States, v. 10, p. 171–172, 1962. DOI: 10.7146/math.scand.a-10524. Disponível em: https://journals.msp.org/mscand/article/view/2668. Acesso em: 25 jul. 2026.