Zlotnik A, Kireeva O. Practical error analysis for the three-level bilinear FEM and finite-difference scheme for the 1D wave equation with non-smooth data. MMA [Internet]. 2018Jun.14 [cited 2025Jan.6];23(3):359-78. Available from: https://mla.vgtu.lt/index.php/MMA/article/view/2807