EMBERGENOVA, Z. K.; SIKHOV, M. B. Estimates of the best approximations of functions with a spectrum with a given majorant. International Journal of Mathematics and Physics, [S. l.], v. 7, n. 1, p. 21–26, 2016. Disponível em: https://ijmph.kaznu.kz/index.php/kaznu/article/view/155. Acesso em: 5 may. 2024.