KONSEVICH, N. M. Estimates of the Best $M$-Term Trigonometric Approximations of the Classes $L_{β, p}^{ψ}$ of Periodic Functions of Many Variables in the Space $L_q$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 7, p. 898–907, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4489. Acesso em: 5 dec. 2025.