Kuo, Chi-Wei, and C. Steve Suh. “Mitigating Grazing Bifurcation and Vibro-Impact Instability in Time-Frequency Domain”. Journal of Applied Nonlinear Dynamics, vol. 5, no. 2, Aug. 2026, pp. 169-84, https://doi.org/10.5890/JAND.2016.06.004.