Quaglia, Giuseppe, Walter Franco, and Matteo Nisi. “Kinematic Analysis of an Electric Stair-Climbing Wheelchair”. Ingenieria y Universidad 21, no. 1 (December 14, 2016): 27–48. Accessed July 2, 2022. https://revistas.javeriana.edu.co/index.php/iyu/article/view/17227.