GILBERT, Ikorong. The short analytic proof of the friendly numbers problem, “THIS PAPER HAS BEEN WITHDRAWN”. International Journal of Advanced Mathematical Sciences, [S. l.], v. 1, n. 4, p. 158–171, 2013. DOI: 10.14419/ijams.v1i4.1170. Disponível em: https://www.sciencepubco.com/index.php/IJAMS/article/view/1170.. Acesso em: 4 may. 2024.