Kal’chukI.V. and KharkevychY.I. 2022. Approximation of the classes $W^{r}_{\beta,\infty}$ by generalized Abel-Poisson integrals. Ukrains’kyi Matematychnyi Zhurnal. 74, 4 (May 2022), 507 - 515. DOI:https://doi.org/10.37863/umzh.v74i4.7164.