Stankiewicz, Anna, and Jerzy Pamin. “Simulation of Instabilities in Non-Softening Drucker-Prager Plasticity”. Computer Assisted Methods in Engineering and Science 8, no. 1 (March 27, 2023): 183–204. Accessed March 13, 2025. https://cames3.ippt.pan.pl/index.php/cames/article/view/1199.