Fedunyk-Yaremchuk O, Hembars'ka S, Romanyuk I. Best $m$-term trigonometric approximations of the isotropic Nikol’skii-Besov-type classes of periodic functions of several variables. Carpathian Math. Publ. [Internet]. 2025 Apr. 21 [cited 2025 Apr. 26];17(1):67-81. Available from: https://personnel.pnu.edu.ua/index.php/cmp/article/view/9088