1. Greene, B. A., Goffen, B. S.;Berkowitz, S.; &Katz, J. Excessive Operative Bleeding due to Anaesthesia. New York State J. Med.611: 3802 (1961).
2. Enderby, G. E. H. Postural Ischaemia and Blood Pressure. Lanceti: 183 (1954).
3. Keele, C. A. &Neil, E. Samson Wright’s Applied Physiology, 10th ed., p. 17. London: Oxford University Press (1961).
4. Little, D. M. “Controlled Hypotension” in anaesthesia and Surgery, 1st ed., p. 78. Springfield, III.: Charles C. Thomas (1956).
5. Aserman, D. Controlled Hypotension in Neurosurgery with Hexamethonium and Procaine amidi. Brit. Med. J.1: 961 (1953).