Sang, Nguyen Chi, and Nguyen Cao Thang. “On the Design of an Optimum Active Mass-Spring-Inverted Pendulum Dynamic Vibration Absorber for the Inverted Pendulum Type Structure”. <i>Vietnam Journal of Mechanics</i> 30, no. 4 (December 31, 2008): 329 – 335. Accessed April 4, 2026. https://vjst.vast.vn/vjmech/article/view/5638.