Md Zain, Badrul Aisham. “The Concept of Flexible Lower Limb Powered-Exoskeleton for Human Performance Augmentation: A Review”. International Journal of Integrated Engineering 16, no. 9 (December 30, 2024): 230–246. Accessed April 9, 2026. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/8100.