Shishkin, Grigorii. “Optimal Difference Schemes on piecewise‐uniform Meshes for a Singularly Perturbed Parabolic convection‐diffusion Equation”. Mathematical Modelling and Analysis 13, no. 1 (March 31, 2008): 99-112. Accessed December 2, 2024. https://mma.vgtu.lt/index.php/MMA/article/view/6994.