BELOV, I. S. On One Generalization of the Hardy–Littlewood–Pólya Inequality. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 4, p. 533–536, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3926. Acesso em: 5 dec. 2025.