KÉZÉR, Ildikó. Some Pythagorean type equations concerning arithmetic functions. Teaching Mathematics and Computer Science, [S. l.], v. 18, n. 2, p. 157–179, 2021. DOI: 10.5485/TMCS.2020.0514. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/10970.. Acesso em: 4 jul. 2024.