REHOUMA, A. On the Fourier coefficients of the derivative with respect to celebrated orthogonal systems. Hilbert Journal of Mathematical Analysis, [S. l.], v. 2, n. 1, p. 034–045, 2024. DOI: 10.62918/hjma.v2i1.19. Disponível em: https://hilbertjma.org/hilbertjma/article/view/19. Acesso em: 20 nov. 2025.