Beckers, Pierre, Hai-Guang Zhong, and Edward Maunder. “Numerical Comparison of Several a Posteriori Error Estimators for 2D Stress Analysis”. European Journal of Computational Mechanics 2, no. 2 (February 27, 1993): 155–178. Accessed August 3, 2024. https://journals.riverpublishers.com/index.php/EJCM/article/view/3669.