Zhu, Y. and Luo, A.C.J. 2026. Bifurcation Dynamics of Periodic Motions in a Duffing Oscillator under Multiple Periodic Excitations. Journal of Vibration Testing and System Dynamics. 10, 2 (Aug. 2026), 191–207. DOI:https://doi.org/10.5890/JVTSD.2026.06.007.