1.
Vakarchuk SB. Jackson-type inequalities with generalized modulus of continuity and exact values of the $n$-widths of the classes of $(ψ,β)$-differential functions in $L_2$. I. Ukr. Mat. Zhurn. [Internet]. 2016Jun.25 [cited 2024Apr.26];68(6):723-45. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1874