Murcinkova, Zuzana, Vladimir Kompis, and Mario Stiavnicky. “Trefftz Functions for 3D Stress Concentration Problems”. Computer Assisted Methods in Engineering and Science 15, no. 3-4 (December 31, 2008): 305–318. Accessed March 5, 2026. https://cames.ippt.gov.pl/index.php/cames/article/view/738.