1. Appenzelter, O.: The Autonomie Nervous System. North-Holland: Amsterdam. 1970.
2. Carron, H., Weller, R. M.: Treatment of post-traumatic sympathetic dystrophy. In: Advances in Neurology (Boniea, J. J., ed.), Vol. 4. International Symposium on Pain. New York: Raven Press. 1974.
3. Gayral, L., Neuwirtk, E.: Otoneuro-opthalmologic manifestation of cervical origin. Posterior cervical sympathetic syndrome of Barré-Lieou. New York State Journal of Medicine54, 1920 (1954).
4. Gross, D.: Pain and autonomic nervous system. In: Advances in Neurology (Bonica, J. J., ed.), Vol. 4. International Symposium on Pain. New York: Raven Press. 1974.
5. Johnson, R. H., Spalding, J. M. K.: Disorders of the Autonomic Nervous System. Oxford: Blackwell. 1974.