1. Cumings, J. N., and Carmichael, E. A. (1934). Brain, 57, 338.
2. Chemical Methods in Clinical Medidne;Harrion, G.A.,1947
3. The Cerebrospinal Fluid and Its Relation to the Blood;Katzenelbogen, S.,1935
4. The Cerebro-Spinal Fluid;Lups, S.; Haan, A.M.F.H.,1954
5. Marks, V. (1959). Clin. Chim. Acta, 4, 395.