Human-like external function of the foot, and fully upright gait, confirmed in the 3.66 million year old Laetoli hominin footprints by topographic statistics, experimental footprint-formation and computer simulation
Robin H. Crompton; Todd C. Pataky; Russell Savage; Kristiaan D'Aout; Matthew R. Bennett; Michael H. Day; Karl Bates; Sarita Morse; William I. Sellers
JOURNAL OF THE ROYAL SOCIETY INTERFACE, Apr. 2012, Peer-reviewed