1. Berrol S (1986) Considerations for management of the persistent vegetative state. Arch Phys Med Rehabil 67:283–285
2. Bricolo A (1976) Prolonged post-traumatic coma. In: Vinken PJ, Bruyn GW, Braakman R (eds) Handbook of clinical neurology, vol 24. Injuries of the brain and skull, part 2. North-Holland, Amsterdam Oxford, pp 699–755
3. Gerstenbrand F (1967) Das traumatische apallische Syndrom. Springer, Wien New York
4. Plum F, Posner JB (1983) The diagnosis of stupor and coma, 4th edn. Davis, Philadelphia
5. Jennett B, Plum F (1972) Persistent vegetative state after brain damage. A syndrome in search of a name. Lancet I:734–737