EICHLER, M. On the Class Number of Imaginary Quadratic Fields and the Sums of Divisors of Natural Numbers. The Journal of the Indian Mathematical Society, [S. l.], v. 19, n. 3-4, p. 153–180, 1955. DOI: 10.18311/jims/1955/17011. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/17011. Acesso em: 27 apr. 2024.