KRASNIQI, Xh.Z. On a necessary condition for $L^p$ $(0 < p < 1)$-convergence (upper boundedness) of trigonometric series. Carpathian Mathematical Publications, [S. l.], v. 7, n. 1, p. 83–90, 2015. DOI: 10.15330/cmp.7.1.83-90. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/1386. Acesso em: 1 may. 2024.