Pieskä, Jali, and Erkki Laitinen. “Comparison of Upwind and Characteristic Schemes for Solving Multiphase Diffusion-Convection Equation”. Computer Assisted Methods in Engineering and Science 7, no. 3 (September 30, 2000): 421–426. Accessed March 5, 2026. https://cames.ippt.gov.pl/index.php/cames/article/view/1246.