Asymptotics of a generalized solution of linear singularly perturbed systems of higher order differential equations with degenerations in the case of multiple spectrum of boundary coupling of matrices. Neliniini Kolyvannya, [S. l.], v. 17, n. 3, p. 379–398, 2014. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/751. Acesso em: 21 jan. 2026.