STASYUK, S. A. Best $m$-term trigonometric approximation for the classes $B^r_{p,θ}$ of functions of low smoothness. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 1, p. 104–111, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2846. Acesso em: 27 apr. 2025.