On the qualitative analysis of solutions of a class of nonlinear differential equations of second-order with constant delay. Neliniini Kolyvannya, [S. l.], v. 25, n. 1, p. 108–118, 2022. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1060. Acesso em: 8 dec. 2025.