HAUKKANEN, P. The Dirichlet Inverse of Ramanujan’s Sum Via Principal Functions. The Journal of the Indian Mathematical Society, [S. l.], v. 66, n. 1-4, p. 61–64, 1999. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/21934. Acesso em: 3 may. 2024.