S. Y. Reutskiy, “Trefftz type method for 2D problems of electromagnetic scattering from inhomogeneous bodies”, Comp. Assist. Methods Eng. Sci., vol. 10, no. 4, pp. 609–618, Jan. 2023, Accessed: Jun. 30, 2025. [Online]. Available: https://cames.ippt.pan.pl/index.php/cames/article/view/1069