[1]
. F. G. Abdullayev and . Y. I. Kharkevych, “Approximation of the classes $C^{\psi}_{\beta}H^{\alpha}$ by biharmonic Poisson integrals”, Ukr. Mat. Zhurn., vol. 72, no. 1, pp. 20–35, Jan. 2020, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1007