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 April 26, 2024. https://vjs.ac.vn/index.php/vjmech/article/view/5730.