Integrability and $L^1$-Convergence of Double Cosine Trigonometric Series. Analysis in Theory and Applications, [S. l.], v. 27, n. 1, p. 32–39, 2018. DOI: 10.1007/s10496-011-0032-8. Disponível em: https://global-sci.com/index.php/ata/article/view/7894. Acesso em: 6 dec. 2025.