RZAEV, R. M. Properties of singular integrals in terms of maximal functions measuring smoothness. Eurasian Mathematical Journal, [S. l.], v. 4, n. 3, p. 107–119, 2013. Disponível em: https://emj.enu.kz/index.php/main/article/view/540. Acesso em: 31 oct. 2025.