Rovenska, O.G. 2023. Approximation of classes of Poisson integrals by Fejer means. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics. 97, (May 2023), 4-12. DOI:https://doi.org/10.26565/2221-5646-2023-97-01.