1. Erlich, P., 1897, Ther. Monatshefte 1:88–90.
2. Lewandowsky, M., 1900, Z. Klin. Med. 40:480–494.
3. Goldmann, E. E., 1909, Beitr. Klin. Chir. 64:192–265.
4. Stern, W. E., and Gautier, R., 1921, Arch. Int. Physiol. 17:138–192.
5. Rapoport, S. I., 1976, Blood-Brain Barrier in Physiology and Medicine, Raven Press, New York.