@article{Kalchuk_Kharkevych_2016, title={I. Approximative properties of biharmonic Poisson integrals in the classes $W^r_{\beta} H^{\alpha}$}, volume={68}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/1936}, abstractNote={We deduce asymptotic equalities for the least upper bounds of approximations of functions from the classes $W^r_{\beta} H^{\alpha}$, and $H^{\alpha}$ by biharmonic Poisson integrals in the uniform metric.}, number={11}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Kalchuk, I. V. and Kharkevych, Yu. I.}, year={2016}, month={Nov.}, pages={1493-1504} }