RUKASOV, V. I.; STEPANETS, O. I. Best “Continuous” $n$-Term Approximations in the Spaces $S_\phi ^p$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 5, p. 663–670, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3941. Acesso em: 6 dec. 2025.