ZhyhalloT. V. and KharkevychY. I. (2017) “Approximating properties of biharmonic Poisson operators in the classes $\hat{L}^{\psi}_{\beta, 1}$ ”, Ukrains’kyi Matematychnyi Zhurnal, 69(5), pp. 650-656. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1724 (Accessed: 21November2024).