1. Bedbrook, G M (1963). Int. J. Paraplegia, 1, 216.
2. Frankel, H L, Hancock, D O, Hyslop, G, Melzak, J, Michaelis, G H, Ungar, G H, Vernon, J D S & Walsh, J J (1969). Int. J. Paraplegia, 7, 179.
3. Guttmann, L (1953). Medical History of the Second World War: Surgery (edited by Sir Zachary Cope), pp. 422–516. London: H.M. Stationery Office.
4. Hardy, A (1972). Personal communication.
5. Nicoll, E A (1949). J. Bone and Joint Surg. 31B, 376.