Asymptotics for solutions of second order differential quations with a rapidly varying nonlinearity. Neliniini Kolyvannya, [S. l.], v. 18, n. 1, p. 29–37, 2015. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/767. Acesso em: 21 jan. 2026.