Asymptotic solutions of singularly perturbed differential algebraic equations with turning points. Neliniini Kolyvannya, [S. l.], v. 24, n. 4, p. 518–534, 2021. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1049. Acesso em: 6 dec. 2025.