KALMENOV, T. S.; SURAGAN, D. On some inequalities of spectral geometry for Riesz potentials. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 75, n. 4, p. 28–35, 2012. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/156. Acesso em: 3 jul. 2024.