Asymptotic Expansion of Solutions to Singular Perturbation Problems in Critical Cases. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 5, n. 3, p. 637–647, 2024. DOI: 10.12150/jnma.2023.637. Disponível em: https://global-sci.com/index.php/jnma/article/view/13706. Acesso em: 6 dec. 2025.