Dang, Nghin, Co Pham, Thong Pham, and Phuc Ho. “Application of Alber’s Principle to Develop a Device Supporting Wheelchair in Stair Climbing”. Science and Technology Development Journal 16, no. 2 (June 30, 2013): 5-12. Accessed November 23, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1505.