On construction of asymptotic solutions of two-point boundary-value problems for degenerate singularly perturbed systems of differential equations. Neliniini Kolyvannya, [S. l.], v. 13, n. 2, p. 272–286, 2010. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/563. Acesso em: 21 jan. 2026.