[1]
T. V. Zhyhallo and Y. I. Kharkevych, “Approximation of (ψ, β)-differentiable functions by Poisson integrals in the uniform metric”, Ukr. Mat. Zhurn., vol. 61, no. 11, pp. 1497–1515, Nov. 2009, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3117