1.
Popovicheva TN, Khlobystov VV. On interpolation approximation of differentiable operators in a Hilbert space. Ukr. Mat. Zhurn. [Internet]. 2006Apr.25 [cited 2024Apr.28];58(4):554–563. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3473