FEDORENKO, A. S. On the best $m$-term trigonometric and orthogonal trigonometric approximations of functions from the classes $L^{Ψ}_{β,ρ}$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 12, p. 1719–1721, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4776. Acesso em: 11 apr. 2025.