1.
Zhyhallo KM, Kharkevych YI. On the Approximation of Functions of the Hölder Class by Biharmonic Poisson Integrals. Ukr. Mat. Zhurn. [Internet]. 2000Jul.25 [cited 2024Nov.24];52(7):971-4. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4496