RAY, B. K. On the Summ Ability (R, log n, 1) of a Sequence Associated with Fourier Coefficients. The Journal of the Indian Mathematical Society, [S. l.], v. 39, n. 1-4, p. 309–313, 1975. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16657. Acesso em: 5 may. 2024.