1. Key, E. A. H., Retzius, G.: Studien in der Anatomie des Nervensystems und des Bindegewebes. Stockholm: Samson and Wallin 1875–1876
2. Weed, L. H.: Studies on cerebro-spinal fluid. No. III. The pathways of escape from the subarachnoid spaces with particular reference to the arachnoid villi. J. Med. Res. 31, 51–91 (1914)
3. Davson, H.: Physiology of the Cerebrospinal Fluid. London: Churchill 1967
4. Di Chiro, G., Larson, S. M., Harrington, T., Johnston, G. S., Green, M. V., Swann, S. J.: Descent of cerebrospinal fluid to spinal subarachnoid space. Acta radiol. (diagn.) 14, 379–384 (1973)
5. Lorenzo, A. V., Hammerstad, J. P., Cutler, R. W. P.: Cerebrospinal fluid formation and absorption and transport of iodide and sulfate from the spinal subarachnoid space. J. Neurol. Sci. 10, 247–258 (1970)