GRACE, Said R.; GRAEF, John R. Oscillatory behavior of second order nonlinear differential equations with a sublinear neutral term. Mathematical Modelling and Analysis, [S. l.], v. 23, n. 2, p. 217–226, 2018. DOI: 10.3846/mma.2018.014. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/1412. Acesso em: 22 may. 2025.