The Defect Iteration of the Finite Element for Elliptic Boundary Value Problems and Petrov-Galerkin Approximation. Journal of Computational Mathematics, [S. l.], v. 16, n. 2, p. 152–164, 1998. Disponível em: https://www.global-sci.com/index.php/JCM/article/view/11267. Acesso em: 6 dec. 2025.