STEPANETS, O. I.; SHYDLICH, A. L. Best $n$-Term Approximations by Λ-Methods in the Spaces $S_ϕ^p$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 8, p. 1107, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3985. Acesso em: 5 dec. 2025.