References
- Vollmer DG, Dacey RG Jr. The management of mild and moderate head injuries. Neurosurg Clin N Am 1991: 2(2): 437–55
- Levin HS, Mattis S, Ruff RM, et al. Neurobehavioral outcome following minor head injury: a three-center study. J Neurosurgery 1987: 66(2): 234–43
- Gronwall D, Wrightson P. Cumulative effect of concussion. Lancet 1975: 2(7943): 995–7