LASURIYA, R. A.; STEPANETS, O. I. Multiple Fourier sums and ψ-strong means of their deviations on the classes of ψ-differentiable functions of many variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 8, p. 1075–1093, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3371. Acesso em: 11 apr. 2025.