MOTORNAYA, O. V. On the asymptotic estimates of the best approximations of differentiable functions by algebraić polynomials in the space $L_1$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 45, n. 6, p. 859–862, 1993. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5874. Acesso em: 5 dec. 2025.