BITIMKHAN, S. Generalization of the Hardy-Littlewood theorem on Fourier series. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 104, n. 4, p. 49–55, 2021. DOI: 10.31489/2021m4/49-55. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/462. Acesso em: 8 jul. 2025.