LASURIYA, R. A. Multiple Fourier Sums on Sets of $\bar \psi$ -Differentiable Functions (Low Smoothness). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 7, p. 911–918, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3966. Acesso em: 11 apr. 2025.