KALIS, H. Effective finite‐difference methods for the solutions of filtration problems in multilayer domains. Mathematical Modelling and Analysis, [S. l.], v. 2, n. 1, p. 84–91, 1997. DOI: 10.3846/13926292.1997.9637071. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/10016. Acesso em: 9 may. 2025.