Caldwell, G. E., & Forrester, L. W. (1992). Estimates of mechanical work and energy transfers: Demonstration of a rigid body power model of the recovery leg in gait. Medicine and science in sports and exercise, 24(12), S. 1396-1412.

Caldwell, Graham E., and Larry W. Forrester. "Estimates of Mechanical Work and Energy Transfers: Demonstration of a Rigid Body Power Model of the Recovery Leg in Gait." Medicine and Science in Sports and Exercise 24, no. 12 (1992): S. 1396-1412.

Caldwell, Graham E., and Larry W. Forrester. "Estimates of Mechanical Work and Energy Transfers: Demonstration of a Rigid Body Power Model of the Recovery Leg in Gait." Medicine and Science in Sports and Exercise 24.12 (1992): S. 1396-1412.