Stein, Erwin, and Stephan Ohnimus. “Equilibrium Method for Postprocessing and Error Estimation in the Finite Element Method”. Computer Assisted Methods in Engineering and Science 4, no. 3-4 (June 19, 2023): 645–666. Accessed January 12, 2025. https://cames3.ippt.pan.pl/index.php/cames/article/view/1396.