1. Plum, R.: Ion homeostasis in cisternal and lumbar cerbrospinal fluid. New Engl. J. Med. 293, 1041 (1975)
2. Posner, J. B., Swanson, A. G., Plum, F.: Acid base in cerebrospinal fluid. Arch. Neurol. 12, 479 (1965)
3. Buchanan, N., Eyberg, C.: Acid base balance of cerebrospinal fluid in acute uncompensated metabolic acidosis of infancy. S. Mr. Med. J. 48, 1471 (1974)
4. Lipschitz, R.: Ph. D. Thesis. University of the Witwatersrand 1975
5. Buchanan, N., Eyberg, C.: Exercises with a blood gas analyzer. S. Afr. Med. J. 47, 1757 (1973)