Hembars’kaSB, Zhyhallo KM. Approximative properties of biharmonic Poisson integrals on Hölder classes. Ukr. Mat. Zhurn. [Internet]. 2017Jul.25 [cited 2024Dec.22];69(7):925-32. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1746