1. Adams, R. D. and Victor M. (1977),Principles of Neurology, McGraw-Hill, New York.
2. Posner, J. B. (1985), inCecil Textbook of Medicine, Wyngaarden, J. B. and Smith, L. H., eds., Saunders, Philadelphia, pp. 2047–2064.
3. Ad Hoc Committee on Classification of Headache (1962),Arch. Neurol.
6, 173–176.
4. Freiedman, A. P. (1972),Med. Clin. No. Am.
56, 1257–1271.
5. Waters, W. E. and O’Connor, P. J. (1975),J. Neurol. Neurosurg. Psych.
38, 613–616.