On asymptotics of solutions of order $n$ nonautonomous ordinary differential equations. Neliniini Kolyvannya, [S. l.], v. 15, n. 4, p. 447–465, 2012. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/665. Acesso em: 12 apr. 2026.