Luo, Albert C. J. “Bifurcations and Saddle-Sink-Source Networks in Variable-Independent Quadratic Systems”. Journal of Vibration Testing and System Dynamics 7, no. 1 (March 1, 2023): 59–112. Accessed October 17, 2026. https://lhscientificpublishing.com/index.php/jvtsd/article/view/103.