A construction of asymptotic solutions of partial systems of differential equations with a deviation of the argument and a degenerate matrix at the derivatives. Neliniini Kolyvannya, [S. l.], v. 5, n. 4, p. 527–539, 2002. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/239. Acesso em: 22 jan. 2026.