A Lyapunov stability proof for nonlinear-stiffness PD control

Brian Armstrong, Joseph McPherson, Yonggang Li. A Lyapunov stability proof for nonlinear-stiffness PD control. In Proceedings of the 1996 IEEE International Conference on Robotics and Automation, Minneapolis, Minnesota, USA, April 22-28, 1996. pages 945-950, IEEE, 1996. [doi]