“Estimates of the best orthogonal trigonometric approximations of the generalized multidimensional analogues of the Bernoulli kernels and classes $L^\psi_{\beta,1}$ in the space $L_q$”, ЗПІМ, vol. 13, no. 1, pp. 300–320, May 2016, Accessed: Aug. 27, 2026. Available: https://trim.imath.kiev.ua/index.php/trim/article/view/225