Serdyuk А. S.; Stepanyuk Т. Estimates of the best m-term trigonometric approximations of classes of analytic functions . Reports of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, n. 2, p. 32–37, 2025. DOI: 10.15407/dopovidi2015.02.032. Disponível em: https://nasu-periodicals.org.ua/index.php/dp/article/view/13370. Acesso em: 10 jan. 2025.