ZhyhalloK. M. and KharkevychY. I. (2009) “Approximation of conjugate differentiable functions by biharmonic Poisson integrals”, Ukrains’kyi Matematychnyi Zhurnal, 61(3), pp. 333-345. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3023 (Accessed: 24November2024).