1. Beletsky, V.V. 1984. Biped walking. Model problems of dynamics and control . Moscow Nauka, p. 286. In Russian.
2. Bogdanov, V.A., and Gurfinkel, V.S. 1976. Biomechanics of human locomotion. In Physiology of Motion. Leningrad Nauka, pp. 276-315. In Russian.