CARELLA, N. A Totient Function Inequality. International Journal of Advanced Mathematical Sciences, [S. l.], v. 1, n. 4, p. 185–189, 2013. DOI: 10.14419/ijams.v1i4.1117. Disponível em: https://sciencepubco.com/index.php/IJAMS/article/view/1117.. Acesso em: 2 may. 2024.