The hybrid mass-spring pendulum model of human leg swinging: stiffness in the control of cycle period. - J. P. Obusek; Kenneth G. Holt; R. M. Rosenstein (Biol. Cybern., 1995)

Adiabatic transformability hypothesis of human locomotion. - Michael T. Turvey; Kenneth G. Holt; J. P. Obusek; A. Salo; Peter N. Kugler (Biol. Cybern., 1996)