BABENKO, V. F.; KOFANOV, V. A.; PICHUGOV, S. A. Approximation of sine-shaped functions by constants in the spaces $L_p,\; p < 1$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 6, p. 745–762, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3795. Acesso em: 6 dec. 2025.