Kalchuk, I. V. (2007) “Approximation of ( ψ, β )-differentiable functions defined on the real axis by Weierstrass operators”, Ukrains’kyi Matematychnyi Zhurnal, 59(9), pp. 1201–1220. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3382 (Accessed: 26April2024).