[1]
A. Serdyuk, V. Sorych, and N. Sorych, “Best approximation by trigonometric polynomials of convolution classes generated by some linear combinations of periodic kernels”, Ukr. Mat. Zhurn., vol. 77, no. 5, pp. 349–363, Jul. 2025, doi: 10.3842/umzh.v77i5.8934.