SERDYUK, A.; SORYCH, V.; SORYCH, N. Best approximation by trigonometric polynomials of convolution classes generated by some linear combinations of periodic kernels. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 5, p. 349–363, 2025. DOI: 10.3842/umzh.v77i5.8934. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8934. Acesso em: 5 dec. 2025.