1.
Rukasov VI, Stepanets OI. Best “Continuous” $n$-Term Approximations in the Spaces $S_\phi ^p$. Ukr. Mat. Zhurn. [Internet]. 2003 May 25 [cited 2025 Dec. 6];55(5):663-70. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3941