Serdyuk, A., and T. Stepaniuk. “Uniform Approximations by Fourier Sums on the Sets of Convolutions of Periodic Functions of High Smoothness”. Ukrains’kyi Matematychnyi Zhurnal 75, no. 4 (May 10, 2023): 542–567. Accessed April 27, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/7411.