Ihlenburg F, Babuška I. Solution of Helmholtz problems by knowledge-based FEM. Comp. Assist. Methods Eng. Sci. [Internet]. 2023 Jun. 19 [cited 2025 Jun. 30];4(3-4):397-415. Available from: https://cames.ippt.pan.pl/index.php/cames/article/view/1381