Lifits, Sergei, Sergei Reutskiy, and Brunello Tirozzi. “Trefftz Spectral Method for Initial-Boundary Problems”. Computer Assisted Methods in Engineering and Science 4, no. 3-4 (June 19, 2023): 549–565. Accessed January 12, 2025. https://cames3.ippt.pan.pl/index.php/cames/article/view/1389.