A. Lawson

Sagittal Joint Kinematics, Moments, and Powers Are Predominantly Characterized by Speed of Progression, Not Age, in Normal Children

B. Stansfield, S. Hillman, M. Hazlewood, 2001, Journal of pediatric orthopedics.

Gait is predominantly characterised by speed of progression, not age, in 5 to 12 year old normal children

B. Stansfield, S. Hillman, M. Hazlewood, 1999 .