S. HASSAN, T. .; M. EL-MATARY, D. B. . Oscillation criteria for third order nonlinear neutral differential equation. PLOMS Mathematics , [S. l.], v. 1, n. 1, 2022. Disponível em: https://plomscience.com/journals/index.php/Math/article/view/16. Acesso em: 21 may. 2024.