KOLOMOITSEV, Yu. S. On moduli of smoothness and Fourier multipliers in $L_p, 0 < p < 1$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 9, p. 1221–1238, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3383. Acesso em: 5 dec. 2025.