V. Kompis, M. Stiavnicky, M. Zmindak, and Z. Murcinkova, “Trefftz radial basis functions (TRBF)”, Comp. Assist. Methods Eng. Sci., vol. 15, no. 3-4, pp. 239–249, Jul. 2022, Accessed: Jun. 30, 2025. [Online]. Available: https://cames.ippt.pan.pl/index.php/cames/article/view/732