Khang, Nguyen Van, Nguyen Phong Dien, and Pham Van Son. “Balancing Conditions of Planar Mechanisms With Multi-Degree of Freedom”. Vietnam Journal of Mechanics 27, no. 4 (December 31, 2005): 204–212. Accessed December 5, 2025. https://vjs.ac.vn/vjmech/article/view/5730.