Dynamic stability of running: the effects of speed and leg amputations on the maximal Lyapunov exponent.
Look N, Arellano CJ, Grabowski AM, McDermott WJ, Kram R, Bradley E. Dynamic stability of running: the effects of speed and leg amputations on the maximal Lyapunov exponent. Chaos. 2013 Dec; 23(4):043131.