Asymptotic solution of the Cauchy problem for the linear singularly perturbed system in case of multiple spectrum of the main operator. Neliniini Kolyvannya, [S. l.], v. 16, n. 2, p. 270–288, 2013. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/698. Acesso em: 21 jan. 2026.