MOTORNY, V. P. Approximation of periodic functions by interpolation polynomials in $L_1$ . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 42, n. 6, p. 781–786, 1990. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8836. Acesso em: 6 dec. 2025.