1. Adams, C. W. M.: Neurohistochemistry. Amsterdam-London-New York: Elsevier 1965.
2. Barka, T., Anderson, P. J.: Histochemistry. New York: Harper and Row 1965.
3. Cervos Navarro, J.: Microscopia electronica de los tumores del sistema nervioso. 3rd Congr. Nacional de Anatomia Patologica Espanola, Bilbao 1967 (in press).
4. Duffell, D., Farber, L., Chou, S., Hartmann, J. F.: Electron microscopic observations on astrocytomas. Amer. J. Path.43, 539?554 (1963).
5. Friede, R. L.: Alexander's disease. Arch. Neurol. (Chic.)11, 414?422 (1964).