Motornaya OV. On the asymptotic estimates of the best approximations of differentiable functions by algebraić polynomials in the space $L_1$. Ukr. Mat. Zhurn. [Internet]. 1993Jun.25 [cited 2024Oct.6];45(6):859–862. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5874