AZAD, Morteza Baniasad; KHOSRAVI, Behrooz. On the sum of element orders of PSL(2, p) for some p. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 42, p. 18–24, 2019. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7267. Acesso em: 27 oct. 2026.