Aal, O. F. A., Aal, M. A., & Qaisia, A. A. (2026). Nonlinear Dynamic Response of a Stiffened Imperfect Beam under Primary Resonance Excitation. Journal of Applied Nonlinear Dynamics, 11(3), 667-702. https://doi.org/10.5890/JAND.2022.09.010