The asymptotic solution of the Cauchy problem for the degenerate singularly perturbed linear system in the case of multiple spectrum of the main operator. Neliniini Kolyvannya, [S. l.], v. 2, n. 1, p. 19–29, 1999. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/36. Acesso em: 22 jan. 2026.