Jakubovičová, Lenka, Milan Vaško, and Vladimir Kompis. “Trefftz Functions Using the Fundamental Solution With the Singularity Outside the Domain”. Computer Assisted Methods in Engineering and Science 10, no. 4 (January 26, 2023): 515–521. Accessed January 11, 2026. https://cames.ippt.pan.pl/index.php/cames/article/view/1061.