Zhyhallo TV, Kharkevych YI. Approximation of $(\psi, \beta)$-Differentiable Functions Defined on the Real Axis by Abel-Poisson Operators. Ukr. Mat. Zhurn. [Internet]. 2005Aug.25 [cited 2024May7];57(8):1097 -. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3667