DUGASSA, T.; FILE, G.; AGA, T. Stable Numerical Method for Singularly Perturbed Boundary Value Problems with Two Small Parameters. Ethiopian Journal of Education and Sciences, [S. l.], v. 14, n. 2, p. 9–27, 2019. DOI: 10.4314/ejesc.v14i2. Disponível em: https://www.ajol.info/index.php/ejesc/article/view/188444. Acesso em: 3 oct. 2026.