Luo, Albert C. J. “The Stability and Bifurcation of the (2m)th-Degree Polynomial Systems”. Journal of Vibration Testing and System Dynamics 4, no. 1 (March 1, 2020): 1–42. Accessed October 17, 2026. https://lhscientificpublishing.com/index.php/jvtsd/article/view/171.