Voĭtovych VA, Musienko AP. Lebesgue type inequalities for the de la Vallée Poussin sums and their interpolation analogues on classes of $(\psi,\bar{\beta})$-differentiable functions. ЗПІМ [Internet]. 2013 Jul. 15 [cited 2025 Apr. 2];10(1):39-58. Available from: https://trim.imath.kiev.ua/index.php/trim/article/view/138