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2. MACCEPA: the Mechanically Adjustable Compliance and Controllable Equilibrium Position Actuator used in the ‘Controlled Passive Walking’ biped Veronica;Van Ham,2005
3. Design and development of a new robot joint using a mechanical impedance adjuster;Morita,1995
4. Design of biped walking robots having antagonistic driven joints using nonlinear spring mechanism;Yamaguchi,1997
5. Design and control of a variable stiffness actuator for safe and fast physical human/robot interaction;Tonietti,2005