LEINDLER, L. On $L^1$-approximation of Trigonometric Series. Journal of Informatics and Mathematical Sciences, [S. l.], v. 2, n. 2 & 3, p. 62–70, 2010. DOI: 10.26713/jims.v2i2 & 3.28. Disponível em: https://www.rgnpublications.com/journals/index.php/jims/article/view/28. Acesso em: 2 may. 2024.