Nonlinear difference-algebraic boundary-value problem in the case of parametric resonance. Neliniini Kolyvannya, [S. l.], v. 24, n. 1, p. 128–140, 2021. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1019. Acesso em: 8 dec. 2025.