p-Multigrid Method for Fekete-Gauss Spectral Element Approximations of Elliptic Problems. Communications in Computational Physics, [S. l.], v. 5, n. 2-4, p. 667–682, 2018. Disponível em: https://global-sci.com/index.php/cicp/article/view/5627. Acesso em: 5 dec. 2025.