Jirousek, Jaroslav, Adam Wróblewski, and Bogdan Szybiński. “Alternative Displacement Frame Formulations in Hybrid-Trefftz Kirchhoff Plate P-Elements”. Computer Assisted Methods in Engineering and Science 4, no. 3-4 (June 19, 2023): 417–451. Accessed January 12, 2025. https://cames3.ippt.pan.pl/index.php/cames/article/view/1382.