Dinh, Nguyen Van, and Tran Kim Chi. “Identifying the Resonance Curve of a System Subjected to Linear and Quadratic Parametric Excitations (case With Damping)”. Vietnam Journal of Mechanics 21, no. 3 (September 30, 1999): 137–146. Accessed April 8, 2025. https://vjs.ac.vn/index.php/vjmech/article/view/9995.