Effects of External Excitation Frequency Variations on the Vibrations of a Cubic Nonlinear Equation. Romanian Journal of Acoustics and Vibration, [S. l.], v. 22, n. 1, p. 32–38, 2025. Disponível em: https://rjav.sra.ro/index.php/rjav/article/view/492.. Acesso em: 16 apr. 2026.