M. ELABBASY, E.; M. EL-MATARY, B. . Oscillation of third order damped nonlinear differential equation. PLOMS Mathematics , [S. l.], v. 1, n. 1, 2022. Disponível em: https://plomscience.com/journals/index.php/Math/article/view/17. Acesso em: 21 may. 2024.