S. A. Diab, “Quadrilateral folded plate structure elements of reduced Trefftz type”, Comp. Assist. Methods Eng. Sci., vol. 10, no. 4, pp. 391–406, Jan. 2023, Accessed: Jun. 30, 2025. [Online]. Available: https://cames.ippt.pan.pl/index.php/cames/article/view/1054