1.
Abdullayev FG, Kharkevych YI. Approximation of the classes $C^{\psi}_{\beta}H^{\alpha}$ by biharmonic Poisson integrals. Ukr. Mat. Zhurn. [Internet]. 2020Jan.15 [cited 2024Nov.21];72(1):20-5. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1007