The following publications are possibly variants of this publication: 
- Lower Limb Exoskeleton Design Based on Knee Joint AssistancePeng Jiang, Ye Wang, Tianqi Shao, Changsoo Han, Lin Wang, Guanglin Li. rcar 2021: 1391-1396 [doi] 
 - Structural Design and Link Optimization for a Lower Limb Exoskeleton with Four Link Knee JointsFei Meng, Zhenhai Zhang, Mohui Xiao, Younan Xu. ijhr, 22(3), 2025.  [doi] 
 - Compliance Control Method of Exoskeleton Robot Assisted by Lower Limb Knee Joint Based on Gait RecognitionDingan Song, Ligang Qiang, Yali Liu, Yangyang Li, Lin Li. icira 2021: 759-768 [doi] 
 - Lower-limb multi-joint stiffness of knee and ankleSang-Hoon Kang, Yupeng Ren, Dali Xu, Li-Qun Zhang. embc 2014: 4009-4012 [doi]