1. Bruyn, G. W.: Calcification and ossification of the cerebral falx and superior longitudinal sinus. Psychiat. Neurol. Neurochir. (Amst.) 66, 98?119 (1963)
2. Cushing, H., Weed, L. H.: Studies of the cerebrospinal fluid and its pathways. IX. Calcareous and osseous deposits in the arachnoidea. Bull. Johns Hopk. Hosp. 26, 367?372 (1915)
3. Du Boulay, G. H.: Principles of X-ray diagnosis of the skull. pp. 247?248. Washington, D.C.: Butterworths 1965
4. Dyke, C. G.: Indirect signs of brain tumor as noted in routine roentgen examinations; displacement of pineal shadow; survey of 300 consecutive skull examinations. Amer. J. Roentgenol. 23, 598?606 (1930)
5. Gorlin, R. J., Pindborg, J. J.: Syndromes of the head and neck. pp. 405 and 487. New York: McGraw-Hill Book Co. 1964