IQBAL, S.; KRULIĆ, K.; PEČARIĆ, J. Improvement of an inequality of G. H. Hardy. Tamkang Journal of Mathematics, [S. l.], v. 43, n. 3, p. 399–416, 2012. DOI: 10.5556/j.tkjm.43.2012.834. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/834. Acesso em: 6 may. 2024.