Asymptotic analysis of a general solution to a linear singularly perturbed system of higher order differential equations with degenerations. Neliniini Kolyvannya, [S. l.], v. 18, n. 1, p. 79–101, 2015. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/771. Acesso em: 21 jan. 2026.