Lasuriya, R. A. (2003) “Multiple Fourier Sums on Sets of $\bar \psi$ -Differentiable Functions (Low Smoothness)”, Ukrains’kyi Matematychnyi Zhurnal, 55(7), pp. 911-918. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3966 (Accessed: 22May2024).