Asymptotic representations of solutions of a nonautonomous second order differential equations with close to power-type nonlinearities. Neliniini Kolyvannya, [S. l.], v. 12, n. 1, p. 3–15, 2009. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/502. Acesso em: 21 jan. 2026.