1. Alexander RM (2003) Principles of animal locomotion. Princeton University Press, Princeton
2. Ashley-Ross AM (1995) Patterns of hind limb motor output during walking in the salamander Dicamptodon tenebrosus, with comparisons to other. J Comp Physiol A 177:273–285
3. Biewener AA (2003) Animal locomotion. Oxford University Press Inc, New York
4. Burke RE (1981) Motor units: Anatomy, physiology, and functional organization. In: Brookhar JM, Mountcastle VB (eds) Handbook of physiology, Sec 1, Vol II, Pt 1, the nervous system: motor control. American Physiological Society, Bethesda, pp 345–422
5. Campbell B (1939) The shoulder anatomy of the moles. A study in phylogeny and adaptation. Dev Dynam 64(1):1–39