1.
Zhyhallo KM, Kharkevych YI. Approximation of conjugate differentiable functions by biharmonic Poisson integrals. Ukr. Mat. Zhurn. [Internet]. 2009Mar.25 [cited 2024Apr.24];61(3):333-45. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3023