1. Brandt T. Coma und Augenbewegungen. In: Brandt T, Büchele W, Jung R, editors. Augenbewegungsstörungen. Leipzig: VEB Georg Thieme; 1983. p. 109–16.
2. Buettner UW, Zee DS. Vestibular testing in comatose patients. Arch Neurol. 1989;46:561–3.
3. Fischer CM. Neurological examination of the comatose patient. Acta Neurol Scand. 1969;45 Suppl 36:1–56.
4. Plum F. Organic disturbances of consciousness. In: Critchley M, O’Leary J, Jennet B, editors. Scientific fundations of neurology. London: William Heinemann; 1973. p. 193–201.
5. Plum F, Posner J. The pathologic physiology of signs and symptoms of coma; pupils, ocular movements. In: Plum F, Posner J, editors. The diagnosis of stupor and coma. 3rd ed. (Contemporary neurology series, Vol 19). Philadelphia: FA Davis; 1980. p. 41–64.