Parametric and External resonances in kinematically and Externally excited nonlinear Spring Pendulum

Roman Starosta, Grazyna Sypniewska-Kaminska, Jan Awrejcewicz. Parametric and External resonances in kinematically and Externally excited nonlinear Spring Pendulum. I. J. Bifurcation and Chaos, 21(10):3013-3021, 2011. [doi]