PATEL, N. V.; SHAH, V. M. On the Order of Fourier Coefficients of a Lacunary Fourier Series. The Journal of the Indian Mathematical Society, [S. l.], v. 53, n. 1-4, p. 209–215, 1988. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/22007. Acesso em: 7 may. 2024.