1. Kerslake, D. Mck., and Cooper, K. E., Clin. Sci., 9, 31 (1950).
2. Appenzeller, O., and Schnieden, H., Clin. Sci., 25, 413 (1963).
3. Appenzeller, O., Arnason, B. G., and Adams, R. D., J. Neurol. Neurosurg. Psychiat., 28, 510 (1965).
4. Holton, P., and Rand, M. J., Brit. J. Pharmacol., 19, 513 (1962).