1. Ramón y Cajal S (1933) Histology, 10th edn. Wood, Baltimore
2. Peters A, Palay SL, Webster HD (1991) The fine structure of the nervous system, 3rd edn. Oxford, New York
3. Kandel ER, Schwartz JH, Jessell TM (2000) Principles of neural science, 4th edn. McGraw-Hill, New York
4. Bradbury M (1979) The concept of a blood–brain barrier. Wiley, Chichester
5. Goldstein GW, Betz AL (1986) The blood–brain barrier. Sci Am 254:74–83