PICHUGOV, S. A. Approximation of compressions of periodic functions in the space $L_p,\; p < 1$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 12, p. 1708–1711, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5566. Acesso em: 7 apr. 2025.