An Upwind Multistep Difference with Mixed Finite Volume Element Method for a Positive Semi-Definite Contamination Treatment Problem. Analysis in Theory and Applications, [S. l.], v. 41, n. 2, p. 111–139, 2025. DOI: 10.4208/ata.OA-2022-0024. Disponível em: https://global-sci.com/index.php/ata/article/view/8312. Acesso em: 5 dec. 2025.