1. Pickering, G. W., “High Blood Pressure” (J. and A. Churchill, London, 1955).
2. Prinzmetal, M., and Wilson, C., J. Clin. Invest., 15, 63 (1936).
3. Pickering, G. W., Clin. Sci., 2, 209 (1936).
4. Hoenig, V., and Schück, O., Rev. Czechoslov. Med., 2, 1 (1956).
5. Hensel, H., and Bender, F., Pflügers Arch., 263, 603 (1956).