1.
Kalchuk IV, Kharkevych YI. Approximation of (ψ, β)-differentiable functions by Weierstrass integrals. Ukr. Mat. Zhurn. [Internet]. 2007Jul.25 [cited 2024Apr.27];59(7):953–978. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3359