Effect of Slow Parameter Variations on the Vibrations of a Duffing Equation. Romanian Journal of Acoustics and Vibration, [S. l.], v. 21, n. 1, p. 27–34, 2024. Disponível em: https://rjav.sra.ro/index.php/rjav/article/view/391.. Acesso em: 1 may. 2026.