Starovoitov AP, Kruglikov IV, Osnach TM. Rational approximations of power series, trigonometric series and series of Chebyshev polynomials. Журнал Белорусского государственного университета. Математика. Информатика. 2024;(3):6-21. Accessed July 18, 2026. https://journals.bsu.by/index.php/mathematics/article/view/6593