Zhyhallo, K.M. and Kharkevych, Y.I. (2009) “Approximation of conjugate differentiable functions by their Abel–Poisson integrals”, Ukrains’kyi Matematychnyi Zhurnal, 61(1), pp. 73–82. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3002 (Accessed: 10 April 2025).