Asymptotic solutions of boundary-value problems for linear singularly perturbed differential-algebraic systems. Neliniini Kolyvannya, [S. l.], v. 27, n. 1, p. 43–55, 2024. DOI: 10.3842/nosc.v27i1.1461. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1128. Acesso em: 8 dec. 2025.