1.
Vakarchuk BS. Jackson-type inequalities with generalized modulus of continuity and exact values of the $n$-widths for the classes of $(ψ,β)$-differentiable functions in $L_2$. III. Ukr. Mat. Zhurn. [Internet]. 2016 Oct. 25 [cited 2025 Apr. 13];68(10):1299-31. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1922