AAS, Hans-fredrick. Congruences for the Coefficients of the Modular Invariant $j(\tau)$. Mathematica Scandinavica, Berkeley, CA, United States, v. 15, p. 64–68, 1964. DOI: 10.7146/math.scand.a-10727. Disponível em: https://journals.msp.org/mscand/article/view/2619. Acesso em: 8 sep. 2026.