KONOHRAI, A. F.; STASYUK, S. A. Best M-term trigonometric approximations of the classes of periodic functions of many variables in the space Lq. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 9, p. 1196 – 1214, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3237. Acesso em: 5 dec. 2025.