BITIMKHAN, S. Hardy-Littlewood theorem for series with general monotone coefficients. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 90, n. 2, p. 43–48, 2018. DOI: 10.31489/2018m2/43-48. Disponível em: https://mts.buketov.edu.kz/mathematics-vestnik/article/view/206. Acesso em: 8 dec. 2025.