L. Jakubovičová, M. Vaško, and V. Kompis, “Trefftz functions using the fundamental solution with the singularity outside the domain”, CAMES, vol. 10, no. 4, pp. 515–521, Jan. 2023, Accessed: Jan. 26, 2025. [Online]. Available: https://cames3.ippt.pan.pl/index.php/cames/article/view/1061