@article{Hrabova_Kalchuk_Stepanyuk_2018, title={On the approximation of the classes $W_{β}^rH^{α}$ by biharmonic Poisson integrals}, volume={70}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/1582}, abstractNote={We obtain asymptotic equalities for the least upper bounds of the deviations of biharmonic Poisson integrals from functions of the classes $W_{β}^rH^{α}$ in the case where $r > 2, 0 \leq \alpha < 1$.}, number={5}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Hrabova, U. Z. and Kalchuk, I. V. and Stepanyuk, T. A.}, year={2018}, month={May}, pages={625-634} }