Novikov, O. O., O. G. Rovenska, and Yu. A. Kozachenko. “Approximation of Classes of Poisson Integrals by Fejer Sums”. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics 870 (February 10, 2018): 4-12. Accessed October 20, 2024. https://periodicals.karazin.ua/mech_math/article/view/11602.