RUAN, Jiechang. NOTES ON THE ARITHMETIC-GEOMETRIC MEAN INEQUALITY FOR SINGULAR VALUES. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 35, p. 227–232, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6439. Acesso em: 16 aug. 2026.