Extrapolation and A-Posteriori Error Estimators of Petrov-Galerkin Methods for Non-Linear Volterra Integro-Differential Equations. Journal of Computational Mathematics, [S. l.], v. 19, n. 4, p. 407–422, 2001. Disponível em: https://www.global-sci.com/index.php/JCM/article/view/11443. Acesso em: 6 dec. 2025.