Rahman, M. Saifur, and Ahmed Hossain. 2026. “Modified Harmonic Balance Method for Solving Nonlinear Free Vibration Problem of Beam Resting on Nonlinear Elastic Foundation”. Journal of Vibration Testing and System Dynamics 3 (2): 133-45. https://doi.org/10.5890/JVTSD.2019.06.003.