1) Cushing H. The third circulation and its channels. In Matson DD, editors. Harvey Cushing: Selected Papers on Neurosurgery. New Haven, Yale University Press; 1969, pp. 289-319.
2) Welch K, Friedman V. The cerebrospinal fluid valves. Brain 1960;83:454-469.
3) McComb JG, Davson H, Hyman S, et al. Cerebrospinal fluid drainage as influenced by ventricular pressure in the rabbit. J Neurosurg 1982;56:790-797.
4) Maurizi CP. Arachnoid granules: Dandy was dandy, cushing and weed were not. Med Hypotheses 2010;75:238-240.
5) Weed LH. Studies of cerebro-spinal fluid. No. III. The pathways of escape from the subarachnoid spaces with particular reference to arachnoid villi. J Med Res 1914;31:51-91.