Order estimates of functionals in terms of which the best $n$-term approximations of classes ${\cal F}_{q,r}^{\psi}$ are expressed. ЗПІМ [Internet]. 2014 Jun. 24 [cited 2026 Sep. 21];11(3):287-314. Available from: https://trim.imath.kiev.ua/index.php/trim/article/view/82