Pointwise Approximation of Corner Singularities for Singularly Perturbed Elliptic Problems with Characteristic Layers. International Journal of Numerical Analysis and Modeling, [S. l.], v. 7, n. 3, p. 416–427, 2010. Disponível em: https://www.global-sci.com/ijnam/article/view/9962. Acesso em: 18 apr. 2026.