Asymptotics of the general solution of the linear singularly perturbed system of higher-order differential equations with degenerations. Neliniini Kolyvannya, [S. l.], v. 21, n. 3, p. 368–396, 2018. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/916. Acesso em: 21 jan. 2026.