RAMANUJAN, S. Irregular Numbers. The Journal of the Indian Mathematical Society, [S. l.], v. 5, n. 3, p. 105–106, 1913. DOI: 10.18311/jims/1913/17739. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/17739. Acesso em: 3 may. 2024.