BabenkoV. F. and KonarevaS. V. (2018) “Jackson – Stechkin-type inequalities for the approximation of elements of Hilbert spaces”, Ukrains’kyi Matematychnyi Zhurnal, 70(9), pp. 1155-1165. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1626 (Accessed: 21July2024).