Oscillation of second order nonlinear impulsive difference equations with continuous variables. Neliniini Kolyvannya, [S. l.], v. 16, n. 2, p. 207–213, 2013. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/693. Acesso em: 12 apr. 2026.