Rovenska, O. G. “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 16, 2023): 4-12. Accessed July 18, 2024. https://periodicals.karazin.ua/mech_math/article/view/21179.