Barrios, T. P., R. Bustinza, and C. Campos. “An A Posteriori Error Estimator for a Non Homogeneous Dirichlet Problem Considering a Dual Mixed Formulation”. Trends in Computational and Applied Mathematics 23, no. 3 (September 12, 2022): 549–568. Accessed July 3, 2024. https://tcam.sbmac.org.br/tema/article/view/1626.