The construction of the asymptotic solution of the Cauchy problem for the degenerated linear system in a singular case. Neliniini Kolyvannya, [S. l.], v. 11, n. 2, p. 271–288, 2008. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/479. Acesso em: 21 jan. 2026.