KALYBAY, A.; SHALGINBAYEVA, S. Additive estimates for discrete Hardy-type operators. Eurasian Mathematical Journal, [S. l.], v. 9, n. 2, p. 44–53, 2018. DOI: 10.32523/2077-9879-2018-9-2-44-53. Disponível em: https://emj.enu.kz/index.php/main/article/view/115. Acesso em: 30 sep. 2026.