Novikov OA, Rukasov VI. Approximation of classes of continuous functions by generalized de la Vallée-Poussin sums. Ukr. Mat. Zhurn. [Internet]. 1995Aug.25 [cited 2024Jul.27];47(8):1069–1079. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5503